2 Thessalonians 2:1-3

Now we beseech you, brethren, touching the coming of our Lord Jesus Christ, and our gathering together unto him;

to the end that ye be not quickly shaken from your mind, nor yet be troubled, either by spirit, or by word, or by epistle as from us, as that the day of the Lord is just at hand;

let no man beguile you in any wise: for it will not be, except the falling away come first, and the man of sin be revealed, the son of perdition,