Cross reference
John 9:25
25 He therefore answered, "I don't know if he is a sinner. One thing I do know: that though I was blind, now I see."
John 5:11
11 He answered them, "He who made me well, the same said to me, 'Take up your mat, and walk.'"
John 9:30
30 The man answered them, "How amazing! You don't know where he comes from, yet he opened my eyes.
1 John 5:10
10 He who believes in the Son of God has the testimony in himself. He who doesn't believe God has made him a liar, because he has not believed in the testimony that God has given concerning his Son.