2 Thessalonians 2:2-3

Do not become easily upset in your thinking or afraid if you hear that the day of the Lord has already come. Someone may have said this in a prophecy or in a message or in a letter as if it came from us. Do not let anyone fool you in any way. That day of the Lord will not come until the turning away from God happens and the Man of Evil, who is on his way to hell, appears.