📖 Biblical Definition
The Day of the Lord in the New Testament is the eschatological day of Christ’s return in glory, bringing final judgment on the wicked and final salvation to the church. It draws on the OT prophets (Joel 2; Amos 5; Zephaniah 1) and is identified explicitly with the Second Coming of Jesus: "the day of the Lord so cometh as a thief in the night" (1 Thessalonians 5:2); "the day of the Lord will come... in the which the heavens shall pass away with a great noise" (2 Peter 3:10; cf. 1 Corinthians 1:8; 5:5). It is sudden, certain, and unmistakable — every eye shall see Him. The Christian lives in light of that day: sober, hopeful, watching.
📜 Webster 1828 Definition
Christ's eschatological day of return.
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The eschatological day of Christ's return — bringing the judgment of the wicked, the deliverance of the faithful, and the consummation of the kingdom; the Old Testament 'day of YHWH' fully identified with the parousia of the Lord Jesus.
📖 Key Scripture
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."
1 Corinthians 1:8 — "Who shall also confirm you unto the end, that ye may be blameless in the day of our Lord Jesus Christ."
⚠️ Modern Corruption
Reduced to Sunday-the-Lord's-day, blunting the eschatological force of the New Testament usage.
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The Day of the Lord is not the weekly Lord's Day — it is the climactic day of Christ's return. Old Testament prophets pointed to it; New Testament writers locate it in Jesus' parousia. Live in light of the Day.
🔗 Greek & Hebrew Roots
Greek hēmera kyriou.
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['Greek', 'G2250', 'hēmera', 'day']
['Greek', 'G2962', 'kyrios', 'Lord']
Usage
"The Day comes as a thief; be ready."
"Sunday is the Lord's Day; the Day of the Lord is yet to come."