what does the bible say about the day of the lord?
"The Day of the Lord" is a biblical term and theme used in both the Hebrew Bible (יֹום יְהוָה) and the New Testament (ἡμέρα κυρίου), as in "The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come" (Joel 2:31, cited in Acts 2:20).