2 Thessalonians 2:15

So then , brothers , stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter .

So then, brothers and sisters, stand firm and hold fast to the teachings we passed on to you, whether by word of mouth or by letter.

Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.