When the Advocate comes, whom I will send you from the Father — the Spirit of truth who goes out from the Father — he will testify about me.
In context
24If I had not done among them the works no one else has done, they would not be guilty of sin. But now they have seen, and they have hated both me and my Father. 25This has happened to fulfill the word written in their law: ‘They hated me for no reason.’ 26When the Advocate comes, whom I will send you from the Father — the Spirit of truth who goes out from the Father — he will testify about me. 27And you also will testify, because you have been with me from the beginning.