2 Thessalonians 2:3-4

Let no man deceive you by any means:

for that day shall not come, except there come a falling away first,

and that man of sin be revealed, the son of perdition;

who opposeth and exalteth himself above all that is called God, or that is worshipped;

so that he as God sitteth in the temple of God, shewing himself that he is God.