"When the Advocate comes, whom I will send to you from the Father – the Spirit of truth who goes out from the Father – he will testify about me." (NIV)

But when the Comforter (Counselor, Helper, Advocate, Intercessor, Strengthener, Standby) comes, Whom I will send to you from the Father, the Spirit of Truth Who comes (proceeds) from the Father, He [Himself] will testify regarding Me. (AMP)

But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me: (KJV)