John the Apostle
1 John 3:24WEB·traditional attribution

He who keeps his commandments remains in him, and he in him. By this we know that he remains in us, by the Spirit which he gave us.

Jamieson-Fausset-Brown Reformed

dwelleth in him--The believer dwelleth in Christ. and he in him--Christ in the believer. Reciprocity. "Thus he returns to the great keynote of the Epistle, abide in Him, with which the former part concluded" (Jo1 2:28). hereby--herein we (believers) know that he abideth in us, namely, from (the presence in us of) the Spirit "which He hath given us." Thus he prepares, by the mention...

Geneva Bible Notes Reformed

And he that keepeth his commandments dwelleth in him, and he in him. And hereby we know that he abideth in us, by the Spirit which he hath given us. (f) He means the Spirit of sanctification, whereby we are born again and live to God.

William Burkitt Anglican

Observe here, 1. The benefit of obedience to God's command. God dwelleth in us, and we in him. God's dwelling in us implies, 1. Right and property; what a man dwells in is his own. 2. Command and authority; the master and owner is the commander and disposer of the house. It also, 3.