an established practice: the way something is regularly and expectedly done, settled by long use rather than by fresh command
TranslatabilityApproximateCertaintySettled
The word points at repetition that has hardened into expectation. Something has been done the same way often enough that it is simply how it is done, and acting otherwise would count as a departure. That is why the New Testament uses one word for a single man's routine and for a whole nation's inherited way of life. The shape of the idea does not change; only the size of the group holding the practice does.
The range runs along a scale of scope:
one person's regular routine, as when Jesus goes out to the Mount of Olives the way he always did
an institution's fixed procedure, as when a Roman governor says his court is not free to hand over an undefended prisoner
a single traditional observance, such as the priest's turn at the incense altar or the Jewish way of preparing a body for burial
the whole inherited body of practice, which in Acts comes close to being a name for Jewish life itself
That last use carries real weight. When Stephen is accused of altering the customs Moses handed down, or Paul of teaching Jews abroad to stop living by them, the charge is not about etiquette but about abandoning the law and the identity built on it. The word sits close to law (νόμος) in those chapters, and close to tradition (παράδοσις), while keeping its own angle: not what was commanded, and not what was passed from hand to hand, but what long practice has made the norm.
Nothing in the word itself says whether a practice is good. It covers the honest piety of a family going up to Jerusalem for the festival just as readily as the drift of believers who had gotten out of the habit of meeting together.
Nuances
1aa personal habit: what someone does regularly enough that it is what you would expect of them
TranslatabilityDirect
Luk 22:39Heb 10:25
1bsettled procedure: the accepted and binding way a body such as a court conducts its business
TranslatabilityDirect
Act 25:16*
1ca traditional observance: one particular practice of worship or public life, handed down and kept as a matter of course
Luk 1:9Luk 2:42Jhn 19:40Act 15:1*
1dthe ancestral customs taken together: the whole inherited body of Jewish practice, treated as binding and as the mark of belonging
Can describe one person's settled habit, with nothing handed on to anyone: Jesus goes to the Mount of Olives the way he always did, and some believers have fallen into the habit of staying away from the gathering.Luk 22:39Heb 10:25
Reaches outside Israel to civic and courtroom practice: what Romans are not permitted to take up, and the standing procedure of Roman justice that gives an accused man his accusers face to face.Act 16:21Act 25:16
Names the fixed way a rite is carried out, the accepted procedure rather than a body of teaching: how the priest on duty was chosen, how a feast was kept, how Jews prepared a body for the grave.Luk 1:9Luk 2:42Jhn 19:40
Both
Both name inherited practice claimed from the ancestors, and both are rendered "custom" or "tradition" in English with little to tell them apart: Paul says he has done nothing against what came down from the fathers, and says he once outstripped his peers in zeal for what came down from his fathers.Act 28:17Gal 1:14
Both mark the line a person is accused of crossing: Paul is charged with telling Jews to abandon what they had always done, and Jesus' disciples are challenged for not living by what the elders laid down.Act 21:21Mat 15:2Mrk 7:5
Both stand for the observance of the Jewish law as something received from Moses and the elders and pressed on others: teachers insist believers be circumcised as Moses laid down, and the elders' rulings govern washing before a meal.Act 15:1Act 6:14Mrk 7:3Mrk 7:9
Points to the handing over itself, so it can name teaching a Christian teacher passed to his hearers and expects them to hold: Paul praises the Corinthians for keeping what he delivered, tells the Thessalonians to hold what they were taught, and treats it as a standard a believer can walk away from.1Co 11:22Th 2:152Th 3:6
Is the word set directly against God's own command: Jesus charges that holding this leaves God's word unheeded and even cancels it, and Paul warns that a merely human version of it can carry believers off.Mrk 7:8Mrk 7:13Mat 15:6Col 2:8
Carries the authority of the people who transmitted it, so it is regularly named after them: what the elders handed down, and what a zealous young Pharisee pursued as the teaching of his ancestors.Mat 15:2Mrk 7:3Gal 1:14
συνήθειαhabit built up by long familiarity with something, an inner accustoming rather than a practice a community formally recognizes
Points to habit built up by repeated exposure, an inner accustoming rather than a rule laid down: those long used to idols still feel the food is really offered to one.1Co 8:7
νόμοςthe law as written and commanded, where this word names what long use has made standard
Names what one person or one group habitually does, with no legal force behind it at all: Jesus regularly went out to the Mount of Olives, and some believers had slipped into the habit of staying away from the gathering.Luk 22:39Heb 10:25
Fits the practice of any people, not only Israel: Festus explains that handing a prisoner over undefended is simply not what Romans do.Act 25:16
Covers unwritten practice that grew up around worship and daily life, where no command is being quoted: the priests' turn at burning incense, and the way Jews wrapped a body for burial.Luk 1:9Jhn 19:40
Both
Both name the settled practice that regulated Jewish life, and both are introduced with "according to" to show that an action was the regular and proper thing to do.Luk 1:9Luk 2:22
Both are traced to Moses as their source, so either can stand for what Israel received through him: the same dispute at Antioch says circumcision is required by the custom of Moses and by the law of Moses.Act 15:1Act 15:5
Both appear in the charges that Stephen and Paul were tearing down Israel's inherited way of life, and the accusations run in parallel: speaking against the law, and changing or abandoning the customs.Act 6:14Act 21:21Act 6:13Act 21:28
Names a written text that can be read aloud and quoted from, so a speaker can ask what stands written in it and answer by citing a line.Luk 10:26Jhn 8:17Jhn 10:34
Names a whole division of Scripture, paired with the Prophets as one of the parts of the Bible being read or fulfilled.Mat 5:17Luk 24:44Act 13:15
Serves as the binding standard a court judges by, so a person can be charged, condemned, or cleared according to it.Jhn 7:51Act 23:3Act 25:8
Carries the whole argument over how a person is put right with God, whether by keeping what is commanded or by trusting God, a debate the other word never enters.Rom 3:20Rom 3:28Gal 2:16
Stretches to name a governing force at work inside a person, the pull toward sin fighting against the mind, and the freeing power that overrules it.Rom 7:23Rom 8:2
ἦθοςthe settled character or morals that a person's habits have produced, rather than the practice being performed
names a practice that marks out a whole people, the recognized way that group does things: how the Jews prepare a body for burial (John 19:40), the practices handed down from Moses (Acts 6:14), and the things Romans are not permitted to take up (Acts 16:21)Jhn 19:40Act 6:14Act 16:21
covers formal procedure attached to an office or a court, what the rules of the role require on a given occasion: the priestly duty assigned by lot (Luke 1:9) and the Roman practice of letting an accused man face his accusers (Acts 25:16)Luk 1:9Act 25:16
describes what a person or group regularly does without judging whether it is good or bad, so it fits both Jesus going out to the Mount of Olives as usual (Luke 22:39) and the believers who had fallen into staying away from the gathering (Hebrews 10:25)Luk 22:39Heb 10:25
is the word used for the yearly and lifelong observances of Israel that a faithful family keeps, such as going up to Jerusalem for the feast (Luke 2:42) and the ancestral practices Paul insists he never taught anyone to abandon (Acts 21:21,Acts 28:17)Luk 2:42Act 21:21Act 28:17
Both
both name what repetition has settled rather than a single act: Jesus going to the Mount of Olives as he regularly did (Luke 22:39), and the moral bent a person has built up over time (1 Corinthians 15:33)Luk 22:391Co 15:33
both describe something a person takes on from the people around them rather than invents alone, whether practices handed down from Moses (Acts 6:14) or character shaped, and spoiled, by the company one keeps (1 Corinthians 15:33)Act 6:141Co 15:33
names the moral character a person's habits have produced, the kind of person they have become, which is why it can be called "good" and why it is the thing bad company ruins (1 Corinthians 15:33)1Co 15:33
points inward at the person rather than outward at an observable practice, so what is spoiled in 1 Corinthians 15:33 is not a procedure anyone could watch being performed but the settled moral bent of the people who keep the wrong company1Co 15:33
ethos in the other biblical languages
חֻקָּהHebrew“statute”a practice fixed by God's own command and kept as an ordinance, rather than one established by long usage
It can name one single person's habit, with nobody prescribing it: Jesus goes out to the Mount of Olives because that is where he regularly went, and some believers have simply fallen into the habit of staying away from the gathering. A habit can therefore be a bad one, since the word reports what a person does rather than what anyone laid down.Luk 22:39Heb 10:25
It covers the settled procedure of a court or a government, cited as the reason a case has to be handled a particular way: a Roman governor explains that Romans do not hand a man over before he has faced his accusers, and a crowd objects that the practices being taught are ones Romans may not take up.Act 25:16Act 16:21
It fits practices that grew up by long use and are written down in no rule at all, such as the way a body was wrapped with spices for burial, or the whole mass of Jewish practice that a foreign ruler could be well informed about.Jhn 19:40Act 26:3
Even a requirement that came from the Law is described with this word as what has been handed down and always done, not as what was decreed: circumcision is "the custom of Moses," the charge against Stephen is that he would change "the customs Moses handed down," and Paul answers that he has done nothing against "the customs of our fathers."Act 15:1Act 6:14Act 28:17
Both
The very same observances sit under both words, which is why one is often the natural English match for the other. Passover is set down in Hebrew as "the ordinance of the Passover" and the priests' service at the sanctuary as a lasting statute for their descendants; in Greek those same two things are simply "the custom of the feast" that a family keeps at Jerusalem and "the custom of the priesthood" that decided whose turn it was to burn incense.Exo 12:43Exo 29:9Luk 2:42Luk 1:9
Both name a whole body of practice that a people lives by, something you "walk in," and both are used in warnings about which body of practice you walk in. Israel is told not to walk in the practices of Egypt and Canaan but in God's own, and the nations' practices are what the northern kingdom went after; in the same idiom, Paul is accused of teaching Jews abroad to stop walking in their inherited practices.Lev 18:3Lev 18:42Ki 17:8Act 21:21
It is something issued, laid down by God (or a ruler) and handed over to be kept, and it regularly comes with wording that fixes it permanently: "a statute for ever throughout your generations." The word points back to the one who set it, not to what people happen to do.Exo 12:14Lev 16:29Lev 23:41Num 10:8
Consequences hang on it. Keeping these regulations brings life and a secure place in the land, while rejecting them brings the covenant curses and exile. Nothing of the sort attaches to a mere practice.Lev 18:5Lev 26:15Deu 28:15Ezk 20:11
It reaches past human behaviour to the fixed orders God set in creation: the appointed courses of the heavens, the settled movements of moon and stars, the reliable weeks of harvest rain. A word for human practice cannot be stretched this way.Job 38:33Jer 31:35Jer 33:25Jer 5:24
It is one named item stacked in the formulas of a written legal code, listed alongside commands and legal rulings, so it takes its force from a document a king or a people can be measured against.Deu 6:21Ki 2:32Ki 17:13Ezk 18:9
מִשְׁפָּטHebrew“justice: judgement”a far wider word for judgment and just ruling that in places means the customary due or practice attached to an office
It names only what is regularly done, never whether the practice is right. Even inside a trial it describes how officials habitually proceed, so a Roman governor can say that handing a man over before he has met his accusers is simply not the Roman way of doing things, and a crowd at Philippi can object to practices it says Romans may not take up, with no claim about justice either way.Act 25:16Act 16:21
It can present the law of Moses itself as inherited practice handed down from ancestors: something opponents fear will be changed, something a man is accused of teaching Jews to stop walking in, something Paul insists he has done nothing against. Described this way, God-given instruction is viewed from the outside as the settled habit of a people rather than as binding decree.Act 6:14Act 15:1Act 21:21Act 28:17
It narrows easily to what one person or a handful of people usually do: the route Jesus regularly took to the Mount of Olives, or the habit some believers had fallen into of staying away from the gathering. The Hebrew word is overwhelmingly about a whole community, its worship, and its courts.Luk 22:39Heb 10:25
Both
Both name the settled way a thing is regularly done, and this narrow patch is where they actually meet: English Bibles reach for "custom" or "manner" for either one. The clearest case is the practice attached to an office or an occasion, whether the fixed way the priests at Shiloh took their portion from what worshippers brought, or the fixed way the priesthood decided whose turn it was to burn incense, or going up to Jerusalem the way the festival was always kept.1Sa 2:13Luk 1:9Luk 2:42
Both can describe a group from the outside, naming what its people habitually do in worship or at a death without approving of it: prophets of Baal gashing themselves in their usual way, resettled nations serving their own gods the way they always had, Jews binding a body for burial as they normally did, and Romans refusing practices they say they cannot take up.1Ki 18:282Ki 17:33Jhn 19:40Act 16:21
It names justice itself, the standard God requires and himself keeps: what Abraham is to teach his household to do, what the judge of all the earth can be trusted to do, what a city is told to seek on behalf of the fatherless, what is to roll down like an unfailing stream, and what God asks of every person. The Greek word for "custom" never carries any of this.Gen 18:19Gen 18:25Isa 1:17Amo 5:24Mic 6:8
It names a court case and the ruling that settles it: the hard case carried up to the judges, the decision a king gives that leaves a nation in awe, the sentence that must never be bent against a poor man or twisted by taking sides.Deu 1:17Deu 17:81Ki 3:28Lev 19:15Exo 23:6
It names a standing ruling God lays down, listed beside his commands and statutes as what Israel is bound to keep, to learn, and to live by.Lev 18:4Deu 4:1Deu 5:1Ezk 20:11
It names the rightful claim the law assigns to someone, a due that can be exercised or withheld: the double share that belongs to a firstborn son, the right to buy back family land, the portion owed to a priest out of what is sacrificed.Deu 21:17Jer 32:7Jer 32:8Deu 18:3
It can name a prescribed pattern or arrangement, the plan by which something is to be set up: the dwelling raised in the way Moses was shown, or lampstands made to their appointed design.Exo 26:302Ch 4:7
What scholars say about ethos
Standard lexicography treats ἔθος as a single term with a two-part range. BDAG distinguishes general "habit, usage" (Luke 22:39;Hebrews 10:25;Acts 25:16) from the predominant New Testament application to rites and practices prescribed by the law of Moses or by Jewish tradition (Luke 1:9; 2:42; John 19:40;Acts 6:14; 15:1; 16:21; 21:21; 26:3; 28:17). LSJ documents the same spread in classical usage, where the noun is formed from the stem of ἔθω and covers habit, usage, and disposition. Documentary evidence collected by Moulton and Milligan attests the term in legal and administrative papyri for established procedure, which supports reading a technical force in Festus's disclaimer at Acts 25:16. The Lukan plural τὰ ἔθη corresponds closely to the Hellenistic Jewish expression for ancestral customs (τὰ πάτρια ἔθη), which Josephus uses of the Jewish people's inherited way of life; commentators on Acts (Bruce; Barrett) read the accusations at 6:14 and 21:21 within that frame, as charges of apostasy from a legally recognized ancestral constitution rather than complaints about social convention. Fitzmyer notes that at Luke 1:9 the noun designates the ordered priestly service governed by the rotation of courses, and Barrett canvasses the question at 16:21 whether the ἔθη in the Philippian charge are specifically Jewish practices or unlicensed foreign religion more broadly.
Sources
BDAG, s.v. ἔθοςlexicon
LSJ, s.v. ἔθοςlexicon
J. H. Moulton and G. Milligan, The Vocabulary of the Greek Testament, s.v. ἔθοςlexicon
EDNT, s.v. ἔθοςlexicon
F. F. Bruce, The Acts of the Apostles: The Greek Text with Introduction and Commentary, on Acts 6:14 and 21:21commentary
C. K. Barrett, The Acts of the Apostles (International Critical Commentary), on Acts 16:21 and 25:16commentary
Joseph A. Fitzmyer, The Gospel According to Luke I-IX (Anchor Bible), on Luke 1:9commentary