1 Enoch 61:5
4 The chosen will begin to dwell with the chosen, and these are the measures which shall be given to faith and which shall strengthen righteousness. 5 And these measures shall uncover all the secrets of the depths of the earth, and those who were destroyed in the wilderness, and those devoured by beasts, and those eaten by the fish of the sea, that they may return and rely on the day of the Chosen One; for none shall be destroyed before the Lord of Spirits, nor can any be destroyed.
1 Corinthians 1:8
5 For you were made rich in every way in him, in all your speech and in every kind of knowledge— 6 just as the testimony about Christ has been confirmed among you— 7 so that you do not lack any spiritual gift as you wait for the revelation of our Lord Jesus Christ. 8 He will also strengthen you to the end, so that you will be blameless on the day of our Lord Jesus Christ. 9 God is faithful, by whom you were called into fellowship with his son, Jesus Christ our Lord.
Notes and References
"... Though the term itself is not used frequently, the concept of a day when God would judge and save pervades this literature (e.g., Apocalypse of Abraham 29:14–21; 1 Enoch 1:3–9; 100:1–6; 2 Baruch 24:1–2; 83:1–7). In some instances an agent of judgment and restoration works on behalf of God, and so the day may be designated by some appropriate expression such as the “day of the Elect One” (1 Enoch 61:5). This day is understood as bringing to an end the present age and to usher in the glorious age to come (e.g., 2 Esdras 7:112–114; 2 Enoch 65:5–11). The Gospels and the letters of Paul use the terms “day of the Lord” and “day of judgment” in continuity with the emphases of Jewish apocalyptic literature (e.g., Matthew 10:15; 11:22, 24; 12:36; 1 Thessalonians 5:2; 2 Thessalonians 2:2). They do, of course, understand the “Lord” in the “day of the Lord” to be a reference to Jesus Christ and his role as judge at the Parousia (e.g., 1 Corinthians 1:8; 5:5; 2 Corinthians 1:14). Also in continuity with Jewish literature, Paul uses the expression “day of Christ” to identify explicitly Jesus Christ as the agent of judgment ..."
Martin, Ralph P. Dictionary of the Later New Testament & Its Developments (p. 431) InterVarsity Press, 1997