John 9:25
So, he answered, "I do not know if he is a sinner or not. But one thing I do know; I used to be blind, but now I can see."
John 5:11
But he replied to them, "The same man who made me well said to me, 'Pick up your cot and walk.'"
John 9:30
The man replied, "Is not that strange! You do not know where he came from and yet he restored my sight! [Note: The next sentence may be the beggar stating the Pharisees' argument. See verse 24].
1 John 5:10
The person who [sincerely] believes in God's Son has the evidence [of it] within his heart, [confirming God's testimony]. The person who does not believe God [i.e., what He says about Jesus], accuses Him of lying, because he has not accepted the [irrefutable] testimony of God concerning [the identity and mission of] His Son.