to hold fast to: to keep a deliberate grip on a person or a thing and stay committed to it in practice
The word is built from a preposition meaning "facing, over against" joined to the everyday verb "to have, to hold." Together they picture holding something over against yourself: getting a grip and keeping it. In older Greek the plain form meant to hold out or withstand, as a besieged city withstands an army, and modern Greek still uses it that way. The New Testament uses only the other form, the one in which the action loops back on the person doing it, so the sense is taking hold of something for yourself and staying with it.
The Greek Old Testament made this the standard word for covenant loyalty. Where Isaiah speaks of foreigners and eunuchs who hold fast to God's covenant, the Greek translators reached for this verb, and they used it again for laying hold of wisdom, for handling the law, and for those who cling to the Lord himself. That background is what every New Testament writer assumes: holding on is what faithfulness looks like from the human side.
All four New Testament uses share one picture and differ only in what is being gripped:
- a master, in the saying that no one can serve two of them
- a trustworthy message, which a church leader must keep hold of
- believers who are weak, whom the strong are told to hold onto
Because the grip is something you do rather than something you feel, the last of these comes into English as "help" or "support." It is the same firm hold, applied to a person who would otherwise slip away.
Nuances
How much of the verb's "take hold of" force remains at 1 Thessalonians 5:14, where the object is fellow believers who are weak, and whether the command is therefore about practical care or about not abandoning them.
- majorityThe word here means practical help and care for those who are morally and spiritually fragile; a reading limited to loyalty, or to holding correct teaching, should be rejected.; BDAG, s.v. ἀντέχω, sense 2; Louw & Nida, Greek-English Lexicon of the New Testament Based on Semantic Domains, §35.44; Malherbe, The Letters to the Thessalonians (Anchor Bible 32B), 316-319; Best, A Commentary on the First and Second Epistles to the Thessalonians (BNTC), 229-231
- minorityThe word keeps its "take hold of and do not let go" force as the governing picture, so loyalty and practical support are both in view, the support following from the grip.; Bruce, 1 and 2 Thessalonians (WBC 45), 122; Holtz, Der erste Brief an die Thessalonicher (EKK 13), on 5:14