John 9:3

9:3 Jesus answered, “Neither this man nor his parents sinned, but he was born blind so that the acts of God may be revealed through what happens to him.

John 9:18-21

9:18 Now the Jewish religious leaders refused to believe that he had really been blind and had gained his sight until at last they summoned the parents of the man who had become able to see. 9:19 They asked the parents, “Is this your son, whom you say was born blind? Then how does he now see?” 9:20 So his parents replied, “We know that this is our son and that he was born blind. 9:21 But we do not know how he is now able to see, nor do we know who caused him to see. Ask him, he is a mature adult. He will speak for himself.”