"But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you." (John 14:26)
"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: (John 15:26)
"And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
Of sin, because they believe not on me;
Of righteousness, because I go to my Father, and ye see me no more;
Of judgment, because the prince of this world is judged." (John 16:8-11)
"Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. He shall glorify me: for he shall receive of mine, and shall shew it unto you." (John 16:14)
"And it is the Spirit that beareth witness, because the Spirit is truth." (1 John 5:6b)