But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
The Arabic and Ethiopic versions render it, "from all our sins"; and this must be ascribed to the greatness of his person, as the Son of God; wherefore the emphasis lies on these words, "his Son": the Son of God, who is equal with God, and is truly and properly God: as it must be the blood of man that must, according to the law, be shed, to atone for and expiate sin, and cleanse from it, and that of an innocent man, who is holy, harmless, and without sin; so it must not be the blood of a mere man, though ever so holy, but the blood of one that is God as well as man; see Acts 20:28. The divine nature of the Son of God, being in union with the human nature, put virtue into his blood to produce such an effect, which still continues, and will, as long as there is any occlusion for it.