If I had not come and spoken to them, they would not have sin; but now they have no excuse for their sin.
Whoever hates me hates my Father also.
If I had not done among them the works that no one else did, they would not have sin. But now they have seen and hated both me and my Father.
It was to fulfill the word that is written in their law, "They hated me without a cause.'
"When the Advocate comes, whom I will send to you from the Father, the Spirit of truth who comes from the Father, he will testify on my behalf.
References for John 15:26
You also are to testify because you have been with me from the beginning.