John 8:25-28

"Who are you," they asked. "Just what I have been telling you from the beginning," Jesus replied. "I have much to say in judgment of you. But he who sent me is trustworthy, and what I have heard from him I tell the world." They did not understand that he was telling them about his Father. So Jesus said, "When you have lifted up the Son of Man, then you will know that I am he and that I do nothing on my own but speak just what the Father has taught me."

But he who sent me is trustworthy 
John 7:28-29  Then Jesus, still teaching in the temple courts, cried out, "Yes, you know me, and you know where I am from. I am not here on my own authority, but he who sent me is true. You do not know him, but I know him because I am from him and he sent me."

and what I have heard from him I tell the world 
John 3:32-34  He testifies to what he has seen and heard, but no one accepts his testimony. Whoever has accepted it has certified that God is truthful. For the one whom God has sent speaks the words of God, for God gives the Spirit without limit.
John 15:15  "I no longer call you servants, because a servant does not know his master's business. Instead, I have called you friends, for everything that I learned from my Father I have made known to you."

When you have lifted up the Son of Man 
John 12:31-33  "Now is the time for judgment on this world; now the prince of this world will be driven out. And I, when I am lifted up from the earth, will draw all people to myself." He said this to show the kind of death he was going to die.

I do nothing on my own but speak just what the Father has taught me 
John 14:23-24  Jesus replied, "Anyone who loves me will obey my teaching. My Father will love them, and we will come to them and make our home with them. Anyone who does not love me will not obey my teaching. These words you hear are not my own; they belong to the Father who sent me."

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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