5:6-8 We are inwardly and outwardly defiled; inwardly, by the power and pollution of sin in our nature. For our cleansing there is in and by Christ Jesus, the washing of regeneration and the renewing of the Holy Ghost. Some think that the two sacraments are here meant: baptism with water, as the outward sign of regeneration, and purifying from the pollution of sin by the Holy Spirit; and the Lord's supper, as the outward sign of the shedding Christ's blood, and the receiving him by faith for pardon and justification. Both these ways of cleansing were represented in the old ceremonial sacrifices and cleansings. This water and blood include all that is necessary to our salvation. By the water, our souls are washed and purified for heaven and the habitation of saints in light. By the blood, we are justified, reconciled, and presented righteous to God. By the blood, the curse of the law being satisfied, the purifying Spirit is obtained for the internal cleansing of our natures. The water, as well as the blood, came out of the side of the sacrificed Redeemer. He loved the church, and gave himself for it, that he might sanctify and cleanse it with the washing of water by the word; that he might present it to himself a glorious church, Eph 5:25-27. This was done in and by the Spirit of God, according to the Saviour's declaration. He is the Spirit of God, and cannot lie. Three had borne witness to these doctrines concerning the person and the salvation of Christ. The Father, repeatedly, by a voice from heaven declared that Jesus was his beloved Son. The Word declared that He and the Father were One, and that whoever had seen him had seen the Father. And the Holy Ghost, who descended from heaven and rested on Christ at his baptism; who had borne witness to Him by all the prophets; and gave testimony to his resurrection and mediatorial office, by the gift of miraculous powers to the apostles. But whether this passage be cited or not, the doctrine of the Trinity in Unity stands equally firm and certain. To the doctrine taught by the apostles, respecting the person and salvation of Christ, there were three testimonies. 1. The Holy Spirit. We come into the world with a corrupt, carnal disposition, which is enmity to God. This being done away by the regeneration and new-creating of souls by the Holy Spirit, is a testimony to the Saviour. 2. The water: this sets forth the Saviour's purity and purifying power. The actual and active purity and holiness of his disciples are represented by baptism. 3. The blood which he shed: and this was our ransom, this testifies for Jesus Christ; it sealed up and finished the sacrifices of the Old Testament. The benefits procured by his blood, prove that he is the Saviour of the world. No wonder if he that rejects this evidence is judged a blasphemer of the Spirit of God. These three witnesses are for one and the same purpose; they agree in one and the same thing.

6. This—the Person mentioned in 1Jo 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 1Jo 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 1Jo 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 His cross" (so "by" is used, Heb 9:12: "by," that is, with, "His own blood He entered in once into the holy place"): a fact seen and so solemnly witnessed to by John. "These two past facts in the Lord's life are this abiding testimony to us, by virtue of the permanent application to us of their cleansing and atoning power."

Jesus Christ—not a mere appellation, but a solemn assertion of the Lord's Person and Messiahship.

not by, &c.—Greek, "not IN the water only, but IN the water and IN (so oldest manuscripts add) the blood." As "by" implies the mean through, or with, which He came: so "in," the element in which He came. "The" implies that the water and the blood were sacred and well-known symbols. John Baptist came only baptizing with water, and therefore was not the Messiah. Jesus came first to undergo Himself the double baptism of water and blood, and then to baptize us with the Spirit-cleansing, of which water is the sacramental seal, and with His atoning blood, the efficacy of which, once for all shed, is perpetual in the Church; and therefore is the Messiah. It was His shed blood which first gave water baptism its spiritual significancy. We are baptized into His death: the grand point of union between us and Him, and, through Him, between us and God.

it is the Spirit, &c.—The Holy Spirit is an additional witness (compare 1Jo 5:7), besides the water and the blood, to Jesus' Sonship and Messiahship. The Spirit attested these truths at Jesus' baptism by descending on Him, and throughout His ministry by enabling Him to speak and do what man never before or since has spoken or, done; and "it is the Spirit that beareth witness" of Christ, now permanently in the Church: both in the inspired New Testament Scriptures, and in the hearts of believers, and in the spiritual reception of baptism and the Lord's Supper.

because the Spirit is truth—It is His essential truth which gives His witness such infallible authority.