John 8:12-19. Jesus shared on his testimony- light of the world. Whoever follows him will never walk in darkness (vs 12, NIV); light of life; he came from heaven and going back to heaven; his testimony is valid by himself yet he is not alone; God, the Father who sent him validates him (the other witness).
If I do judge, my decisions are right, because I am not alone (vs 16, NIV).
John 8:12-19 GNB
[12]Jesus spoke to the Pharisees again. “I am the light of the world,” he said. “Whoever follows me will have the light of life and will never walk in darkness.”
[13]The Pharisees said to him, “Now you are testifying on your own behalf; what you say proves nothing.”
[14]“No,” Jesus answered, “even though I do testify on my own behalf, what I say is true, because I know where I came from and where I am going. You do not know where I came from or where I am going.
[15]You make judgements in a purely human way; I pass judgement on no one.
[16]But if I were to do so, my judgement would be true, because I am not alone in this; the Father who sent me is with me.
[17]It is written in your Law that when two witnesses agree, what they say is true.
[18]I testify on my own behalf, and the Father who sent me also testifies on my behalf.”
[19]“Where is your father?” they asked him. “You know neither me nor my Father,” Jesus answered. “If you knew me, you would know my Father also.”