Berean Study Bible
not to be easily disconcerted or alarmed by any spirit or message or letter seeming to be from us, alleging that the Day of the Lord has already 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.

American Standard 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 just 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.

Douay-Rheims Bible
That you be not easily moved from your sense, nor be terrified, neither by spirit, nor by word, nor by epistle, as sent from us, as if the day of the Lord were at hand.

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;

Young's Literal Translation
that ye be not quickly shaken in mind, nor be troubled, neither through spirit, neither through word, neither through letters as through us, as that the day of Christ hath arrived;