Albert Barnes on 1 Timothy 6:21

Which some professing. Evidently some who professed to be true Christians. They were attracted by false philosophy, and soon, as a consequence, were led to deny the doctrines of Christianity. This result has not been uncommon in the world.

Have erred concerning the faith. 1Timm 1:6; 1Timm 1:7; 1Timm 6:10.

Grace be with thee. Rom 1:7.

On the subscription at the close of this epistle, see Intro. para. 2. It is, like the other subscriptions at the close of the epistles, of no authority.

(c) "erred" 2Ti 2:18.