New American Standard Bible (©1995)
that you not be quickly shaken from your composure or be disturbed either by a spirit or a message or a letter as if from us, to the effect that the day of the Lord has come.
King James Bible
That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.
Darby Bible Translation
that ye be not soon shaken in mind, nor troubled, neither by spirit, nor by word, nor by letter, as if it were by us, as that the day of the Lord is present.
English Revised Version
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 now present;
Online Parallel Bible