And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.
Agree in one, х eis (G1519) to (G3588) hen (G1520) eisin (G1526)] - 'tend unto one result:' their agreeing testimony to Jesus' Sonship and Messiahship they give by the sacramental grace in water-baptism, received by the penitent believer through His atoning blood, and through His inwardly witnessing Spirit (1 John 5:10); answering to the testimony given to Jesus' Sonship and Messiahship by His baptism, His crucifixion, and the Spirit's manifestations in Him (note, 1 John 5:6). It was by coming by water (i:e., His baptism in Jordan) that Jesus was solemnly inaugurated in office, and revealed as Messiah. This must have been peculiarly important in John's estimation, since he was first led to Christ by John the Baptist's testimony. By Christ's baptism then, by His redeeming blood-shedding, and by what the Spirit of God, whose witness is infallible, effected, and still effects, by Him, the Spirit the water, and the blood unite, as the threefold witness, to verify His divine Messiahship (Neander).