James 5:19 - Joseph Benson’s Commentary on the Old and New Testaments

Brethren As if he had said, I have now warned you of those things to which you are most liable. And in all these respects watch, not only over yourselves, but every one over his brother also. Labour, in particular, to recover those that are fallen. For if any of you do err from the truth From the right way in which he ought to walk, if he be seduced by any means from the doctrine and practice of the gospel; and one Any one; convert him Be a means of bringing him back into that way from which he had wandered; let him know Who has been enabled to effect so good a work; that he who converteth a sinner from the error of his way From the false doctrine and bad practice to which he had turned aside, shall produce a much happier effect than any miraculous cure of the body; for he shall save a precious immortal soul from spiritual and eternal death, and shall hide a multitude of sins Namely, the sins of the persons thus converted, which shall no more, how many soever they are, be remembered to his condemnation. “The covering of sin is a phrase which often occurs in the Old Testament, and always signifies the pardoning of sin. Nor has it any other meaning here. For surely it cannot be the apostle's intention to tell us, that the turning of a sinner from the error of his way will conceal from the eye of God's justice a multitude of sins committed by the person who does this charitable office, if he continueth in them. Such a person needs himself to be turned from the error of his way, in order that his own soul may be saved from death. St. Peter has a similar expression, (1 Peter 4:8,) love covereth a multitude of sins; not, however, in the person who is possessed of love, but in the person who is the object of his love.” Macknight.