"About the coming of our Lord Jesus Christ and the day we're all gathered together to meet him — please, don't let yourselves be quickly shaken or thrown into panic. Not by some supposed prophecy. Not by a sermon someone preached. Not even by a letter that claims to be from us, saying the day of the Lord has already come.
Don't let anyone deceive you about this. That day will not come until the great rebellion happens first — and the man of lawlessness is revealed. The one destined for destruction. He will oppose and exalt himself above every so-called god, above everything people worship, until he actually sits in the Temple of God and declares himself to be God."