James
James 5:19ESV·traditional attribution

My brothers, if anyone among you wanders from the truth and someone brings him back,

Matthew Henry Presbyterian @wholebiblehenry

This epistle now drawing to a close, the penman goes off very quickly from one thing to another: hence it is that matters so very different are insisted on in these few verses. I. The sin of swearing is cautioned against: But above all things, my brethren, swear not, etc., Jam 5:12.

Commenting on James 5:12-20

John Gill Reformed Baptist @doctorgill

Brethren, if any of you do err from the truth,.... Either from Christ, who is the truth, by departing from him, forsaking his ways, worship, and ordinances; or from the Scriptures of truth, not speaking according to them, and embracing notions that are contrary unto them; or from the Gospel, the word of truth, from the doctrine of faith, and from uprightness of life and...

Albert Barnes Presbyterian @notesbybarnes

Verse 19. Brethren, if any of you do err from the truth. Either doctrinally and speculatively, by embracing error; or practically, by falling into sinful practices. Either of these may be called "erring from the truth," because they are contrary to what the truth teaches and requires.