1 John 5:6

“This is he that came by water and blood, [even] Jesus Christ, &c.] By “water” is not meant the ablutions or washings of the ceremonial law; Christ came not by these, but to make an end of them; his blood, which cleanseth from all sin, being the antitype, and so the fulfilling end of them: nor the purity of his nature, life, and conversation; though he came into the world that holy thing which is called the Son of God; and was holy in his nature, and harmless in his life, and did no sin, and so was fit to be a sacrifice for the sins of others: nor does it intend the washing and cleansing of his people from their sins; this is what he came to do, and has done, and not what he came by: but the…”

“This--the Person mentioned in Jo1 5:5. This Jesus. he that came by water and blood--"by water," when His ministry was inaugurated by baptism in the Jordan, and He received the Father's testimony to His Messiahship and divine Sonship. Compare Jo1 5:5, "believeth that Jesus is the Son of God," with Joh 1:33-34, "The Spirit . . . remaining on Him . . . I saw and bare record that this is the Son of God"; and Jo1 5:8, below, "there are three that bear witness in earth, the Spirit, and the water, and the blood." Corresponding to this is the baptism of water and the Spirit which He has instituted as a standing seal and mean of initiatory incorporation with Him. and blood--He came by "the blood of…”

“This is he - This Son of God referred to in the previous verse. The object of the apostle in this verse, in connection with 1 John 5:8, is to state the nature of the evidence that Jesus is the Son of God. He refers to three well-known things on which he probably had insisted much in his preaching - the water, and the blood, and the Spirit. These, he says, furnished evidence on the very point which he was illustrating, by showing that that Jesus on whom they believed was the Son of God. “This,” says he, “is the same one, the very person, to whom the well-known and important testimony is borne; to him, and him alone, these undisputed things appertain, and not to any other who should claim to…”

“This is he - St. John here shows the immovable foundation of that faith that Jesus is the Son of God; not only the testimony of man, but the firm, indubitable testimony of God. Who came - Jesus is he of whom it was promised that he should come; and who accordingly, is come. And this the Spirit, and the water, and the blood testify. Even Jesus - Who, coming by water and blood, is by this very thing demonstrated to be the Christ. Not by the water only - Wherein he was baptized. But by the water and the blood - Which he shed when he had finished the work his Father had given him to do. He not only undertook at his baptism "to fulfil all righteousness," but on the cross accomplished what he had…”

“5:6 And Jesus Christ was revealed as God’s Son by his baptism in water and by shedding his blood on the cross (literally This is he who came by water and blood): John’s contemporary, the heretic Cerinthus, taught that “the Christ” descended as a spirit on the man Jesus when he was baptized but left him before he died. The truth is that Jesus’ baptism and death confirmed his identity as the Christ, the Son of God. Jesus of Nazareth was and is truly the Christ, the Son of God, from the beginning and forever.”

“is he: Joh 19:34, Joh 19:35 by water and: Isa 45:3, Isa 45:4; Eze 36:25; Joh 1:31-33, Joh 3:5, Joh 4:10, Joh 4:14, Joh 7:38, Joh 7:39; Act 8:36; Eph 5:25-27; Tit 3:5; Pe1 3:21 blood: Jo1 1:7, Jo1 4:10; Lev 17:11; Zac 9:11; Mat 26:28; Mar 14:24; Luk 22:20; Joh 6:55; Rom 3:25; Eph 1:7; Col 1:4; Heb 9:7, Heb 9:14, Heb 10:29, Heb 12:24, Heb 13:20; Pe1 1:2; Rev 1:5, Rev 5:9, Rev 7:14 the Spirit that: Jo1 5:7, Jo1 5:8; Joh 14:17, Joh 15:26; Ti1 3:16 is truth: Joh 14:6, Joh 16:13 1 John 5:7”