New American Standard Bible (©1995)
So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us.
King James Bible
Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.
Darby Bible Translation
So then, brethren, stand firm, and hold fast the instructions which ye have been taught, whether by word or by our letter.
English Revised Version
So then, brethren, stand fast, and hold the traditions which ye were taught, whether by word, or by epistle of ours.
Online Parallel Bible