📖 Biblical Definition
The Day of the LORD is the prophetic day of the LORD's decisive intervention in history for judgment of His enemies and salvation of His people. It appears in the Old Testament prophets (Joel, Amos, Zephaniah, Isaiah, etc.) sometimes as a near-historical event, sometimes as the final day. The New Testament collapses both into the day of Christ's return: the day of the Lord so cometh as a thief in the night (1 Thess 5:2).
📜 Webster 1828 Definition
(Composite.) The prophetic day of God's decisive intervention; near and far horizons converging on Christ's return.
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Old Testament occurrences: Joel 1:15, 2:1, 2:31, 3:14; Amos 5:18-20; Isaiah 13:6, 13:9; Zephaniah 1:7, 1:14-18; Malachi 4:5. Sometimes refers to specific historical judgments (Babylon, Edom); always with eschatological overtones.
New Testament occurrences: Acts 2:20 (citing Joel 2), 1 Thess 5:2, 2 Thess 2:2, 2 Pet 3:10. Also day of Christ (Phil 1:6, 1:10, 2:16) and day of God (2 Pet 3:12).
📖 Key Scripture
Joel 2:31 — "The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come."
Zephaniah 1:14 — "The great day of the LORD is near, it is near, and hasteth greatly."
1 Thessalonians 5:2 — "For yourselves know perfectly that the day of the Lord so cometh as a thief in the night."
2 Peter 3:10 — "But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise."
⚠️ Modern Corruption
Modern Christianity often softens the Day of the LORD into vague optimism; Scripture treats it as imminent, decisive, and double-edged.
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Amos 5:18-20 contains a sharp warning: Woe unto you that desire the day of the LORD! to what end is it for you? the day of the LORD is darkness, and not light. The Day is good news to the faithful and terror to the unfaithful. The same day, two reactions.
1 Thessalonians 5 frames the saint's posture: not in darkness, not asleep; sober, watching, armored. The Day comes as a thief to those who do not expect it; to the saint, watching, it is the consummation.
🔗 Greek & Hebrew Roots
Hebrew yom YHWH is the foundational phrase.
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Hebrew yom YHWH — day of YHWH; the prophetic day of decisive divine action.
Greek hêmera Kyriou — day of the Lord; the New Testament equivalent.
Usage
"The Day is good news to the faithful and terror to the unfaithful."
"Comes as a thief to those who do not expect it."
"Same day, two reactions."