Matthew 24:42; 2 Thessalonians 2:3-4

42 Watch therefore, for you do not know what hour your Lord is coming.

3 Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition,

4 who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God in the temple of God, showing himself that he is God.