John the Apostle
1 John 3:5WEB·traditional attribution

You know that he was revealed to take away our sins, and in him is no sin.

John Gill Reformed Baptist

And ye know that he was manifested,.... This is a truth of the Gospel the saints were well instructed in and acquainted with; that Jesus Christ, the Word and Son of God, who is here meant, who was with the Father, and lay in his bosom from all eternity, was in the fulness of time made manifest in the flesh, or human nature, by assuming...

Geneva Bible Notes Reformed

And ye know that he was manifested to take away our sins; and in him is no sin. (6) An argument taken from the material cause of our salvation: Christ in himself is most pure, and he came to take away our sins, by sanctifying us with the Holy Spirit, therefore whoever is truly a partaker of Christ, does not give himself to sin, and...

Jamieson-Fausset-Brown Reformed

Additional proof of the incompatibility of sin and sonship; the very object of Christ's manifestation in the flesh was to take away (by one act, and entirely, aorist) all sins, as the scapegoat did typically. and--another proof of the same. in him is no sin--not "was," but "is," as in Jo1 3:7, "He is righteous," and Jo1 3:3, "He is pure." Therefore we are to be so.