'Epistle' in the Bible

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;

So then, brethren, stand fast, and hold the traditions which ye were taught, whether by word, or by epistle of ours.

And if any man obeyeth not our word by this epistle, note that man, that ye have no company with him, to the end that he may be ashamed.

The salutation of me Paul with mine own hand, which is the token in every epistle: so I write.