yom

One of the most frequent nouns in the Hebrew Bible. Magne Saebo's TDOT article counts 2,291 occurrences (1,446 singular, 845 plural), making it the fifth most common noun in the Old Testament; electronic databases with a different counting convention reach 2,303 to 2,304, so approximately 2,300 is the safe figure. BDB, HALOT (2:399-401), DCH (vol. IV) and Saebo agree on the same progression of senses: daylight over against night; the natural day of evening and morning; a dated calendar day; a specific appointed occasion (a birthday, Gen 40:20; a day of distress, Gen 35:3; a wedding day, Song 3:11); an indefinite period, where Saebo notes that ba-yom ha-hu (on that day) often refers to a lengthy period of indefinite duration (Isa 2:20; Jer 4:9; Amos 8:9); and, in the plural, ordinary days, a lifetime (kol yeme), or a year (Lev 25:29; 1 Sam 27:7). Saebo also stresses the syntactic point that be-yom with an infinitive, nearly seventy times, functions as a general temporal conjunction (when), as in Gen 2:4b, without the underlying sense day being wholly absent.

Etymology: cognates run across the Semitic family (Akkadian umu(m), Ugaritic ym, Phoenician ym, Aramaic yawma, Arabic yawm, Old South Arabian ywm, Geez yom), and comparative Semitists reconstruct Proto-Semitic *yawm-. The traditional derivation from an unused root meaning to be hot, still printed in Strong's, is now widely regarded as folk etymology. A separate comparative thread notes that Akkadian umu also denotes storm and appears in storm-demon names (Ugallu, umu rabu; umu dabrutu in Enuma Elish); most scholars treat the Mesopotamian storm-day motif as suggestive background for the theophanic storm-and-darkness imagery of the Day of YHWH rather than evidence of a loan into Hebrew.

Genesis 1 is contested along several axes at once: authorial intent regarding day length (Barr, with Fretheim's observation that a numbered day is elsewhere an ordinary day), the day-age reading (Ross, Archer), the framework or two-triad literary reading (Noordtzij, Kline, Blocher, Irons), the analogical workday reading (Collins), the functional or cosmic-temple inauguration reading (Walton, who accepts twenty-four hour days while denying that the account concerns material manufacture), and the priestly literary week that sanctifies time and culminates in the Sabbath (Smith, following Hurowitz on temple-building language; von Rad, Westermann, Wenham, Sarna). On Gen 1:5 the cardinal yom ehad rather than the expected ordinal has drawn two explanations: Cassuto, following Ramban, that first implies precedence over something already existing, and Steinmann (JETS 45/4, 2002), that the phrase defines the unit for the days that follow; LXX and Vulgate both render the cardinal (hemera mia, dies unus). The seventh day uniquely lacks the evening-and-morning closing, which framework interpreters and the argument of Hebrews 4 take as marking an open-ended rest.

The Day of YHWH: origin theories are in genuine conflict (von Rad on holy war; Mowinckel on the autumn enthronement festival; Cross and Hanson on the divine warrior and the roots of apocalyptic; Weiss against any prior fixed popular conception; Hoffmann on Zephaniah as the point at which the phrase becomes a fixed eschatological term; Stuart on royal campaign language and treaty curses). The usage trajectory from Amos 5:18-20 (the reversal of popular expectation) through Isaiah 2 and 13, Zephaniah 1, Joel, Obadiah 15, Ezekiel 30, Zechariah 14 and Malachi 3-4 moves from judgment on Israel to judgment on the nations to cosmic eschatology. In the New Testament hemera kyriou carries this forward around the parousia (1 Thess 5:2; 2 Pet 3:10; Acts 2:20 quoting Joel 2:31); Beale notes that the different construction in Rev 1:10 (he kyriake hemera) is never used of the Day of the Lord in the LXX, NT, or early fathers.

Two further debates bear on the word. First, when the Israelite day began: Milgrom argued from priestly sacrificial rules for a morning-to-morning reckoning and treated evening-to-evening as largely a later rabbinic norm, Morgenstern posited a shift to evening reckoning under Babylonian influence, de Vaux surveyed the transition, Stern urged caution about the postexilic evidence, and Rashbam read Gen 1:5 itself as implying a morning start. Second, whether yom idioms serve as dating criteria: the syndetic distributive yom wa-yom (Esth 3:4), paralleled by ir wa-ir and ish wa-ish, clusters in the demonstrably late books and is treated as a Late Biblical Hebrew marker by Hurvitz and Polzin (after Kropat), while Young, Rezetko and Ehrensvard argue such markers reflect style rather than chronology. Related idioms include kol yeme (a lifetime), mi-yom (from the day that), ad ha-yom ha-zeh (the etiological until this day), be-aharit ha-yamim (in the latter days, non-eschatological in Gen 49:1, Num 24:14, Deut 31:29 and fully eschatological in Isa 2:2, Mic 4:1, Dan 10:14, with Akkadian parallels ana ahrat ume that lack eschatological force), yamim rabbim, yeme qedem, orek yamim (Ps 21:5; Prov 3:2) and sabea yamim (Job 42:17). The Septuagint standard rendering is hemera; the Targums use yoma and the Vulgate dies.