n2Thess 2:1-2 (NIV) Concerning
the coming of our Lord Jesus Christ
and our being gathered to him, we ask you,
brothers, 2 not to become easily unsettled
or alarmed by some prophecy, report or
letter supposed to have come from us, saying
that the day of the Lord has already come.
nApparently refers to an attempt to forge a letter from Paul.