1 John 5:6

Verse 6. This is he that came by water and blood.

He, through whom the victory over the world was achieved, the Son of God he came by water. He was first announced by the Father as his Son, at his baptism. As he came up out of the water, then it was that the heavens were opened, and God spake from his throne: "This is my beloved Son, in whom I am well pleased" (Matthew 3:17).

Blood.

On Calvary's mount he shed his blood. Without his death there could be no resurrection. By that resurrection he was "declared to be the Son of God, with power" (Romans 1:4). But it was while on this cross both water and blood flowed from him. "But one of the soldiers with a spear pierced his side, and forthwith came there out blood and water" (John 19:34). Hence, we have two rites, both of which are commemorative and monumental, and so long as time shall be, both give their testimony to the Lord Jesus. We are baptized into his death, and we partake of the Lord's Supper. "Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?" (Romans 6:3.) "For I have received of the Lord that which also I delivered unto you, That the Lord Jesus, the same night in which he was betrayed, took bread: and when he had given thanks, he brake it, and said, Take, eat; this is my body, which is broken for you: this do in remembrance of me. After the same manner also he took the cup, when he had supped, saying: This cup is the New Testament in my blood; this do ye, as oft as ye drink it, in remembrance of me. For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come" (1 Corinthians 11:23-26). Both these institutions are monumental and bear testimony not one, but both. Besides these, the Spirit also testified. He came on Pentecost, and spoke through the apostles, and his testimony we have now of record for our study and guidance.