New Revised Standard Version
There is another who testifies on my behalf, and I know that his testimony to me is true.

Contemporary English Version
But there is someone else who speaks for me, and I know what he says is true.

New American Bible
But there is another who testifies on my behalf, and I know that the testimony he gives on my behalf is true.

Douay-Rheims Bible
There is another that beareth witness of me: and I know that the witness which he witnesseth of me is true.

There is another that beareth witness of me: and I know that the witness which he witnesseth of me is true.

is another.

John 5:36,37 But I have a greater testimony than that of John: for the works which the Father hath given me to perfect, the works themselves which I do, give testimony of me, that the Father hath sent me. . . .

John 1:33 And I knew him not: but he who sent me to baptize with water said to me: He upon whom thou shalt see the Spirit descending and remaining upon him, he it is that baptizeth with the Holy Ghost.

John 8:17,18 And in your law it is written that the testimony of two men is true. . . .

John 12:28-30 Father, glorify thy name. A voice therefore came from heaven: I have both glorified it and will glorify it again. . . .

Matthew 3:17 And behold a voice from heaven saying: This is my beloved Son, in whom I am well pleased.

Matthew 17:5 And as he was yet speaking, behold a bright cloud overshadowed them. And lo a voice out of the cloud, saying: This is my beloved Son, in whom I am well pleased: hear ye him.

Mark 1:11 And there came a voice from heaven: Thou art my beloved Son; in thee I am well pleased.

Luke 3:22 And the Holy Ghost descended in a bodily shape, as a dove, upon him. And a voice came from heaven: Thou art my beloved Son. In thee I am well pleased.

1 John 5:6-9 This is he that came by water and blood, Jesus Christ: not by water only but by water and blood. And it is the Spirit which testifieth that Christ is the truth. . . .

and I.

John 12:50 And I know that his commandment is life everlasting. The things therefore that I speak, even as the Father said unto me, so do I speak.