John 8:15-18

"You judge by human standards; I pass judgment on no one. But if I do judge, my decisions are true, because I am not alone. I stand with the Father who sent me. In your own Law it is written that the testimony of two witnesses is true. I am one who testifies for myself; my other witness is the Father, who sent me."

You judge by human standards 
John 7:24  "Stop judging by mere appearances, but instead judge correctly."

I pass judgment on no one 
John 3:17  For God did not send his Son into the world to condemn the world, but to save the world through him.

I stand with the Father who sent me 
John 5:30  "By myself I can do nothing; I judge only as I hear, and my judgment is just, for I seek not to please myself but him who sent me."

In your own Law it is written that the testimony of two witnesses is true 
Matthew 18:16  "But if they will not listen, take one or two others along, so that 'every matter may be established by the testimony of two or three witnesses.' "
Deuteronomy 17:6  On the testimony of two or three witnesses a person is to be put to death, but no one is to be put to death on the testimony of only one witness. 
Deuteronomy 19:15  One witness is not enough to convict anyone accused of any crime or offense they may have committed. A matter must be established by the testimony of two or three witnesses.
2 Timothy 5:19  Do not entertain an accusation against an elder unless it is brought by two or three witnesses.
Hebrews 10:28  Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. 

my other witness is the Father, who sent me 
John 5:37-38  "And the Father who sent me has himself testified concerning me. You have never heard his voice nor seen his form, nor does his word dwell in you, for you do not believe the one he sent." 

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