What does John 9:26 mean?

Jesus' healing of a man born blind is clearly miraculous (John 9:1–7). It corresponds to Old Testament prophecies of the Messiah (Isaiah 29:18; 35:5; 42:7). And yet, Jesus' religious critics refuse to accept that He is acting with divine power (John 9:16). They go so far as to threaten those who accept Jesus' claims with excommunication (John 9:22). In an effort to debunk the miracle, the scribes and Pharisees of Jerusalem interrogated the healed man (John 9:13), as well as his parents (John 9:18).

This is part of a second round of questioning of the formerly-blind man. Asking the same questions more than once is a common interrogation tactic. The questioner is looking for inconsistency, or other signs that the story is a lie. These men have already asked the healed man what happened, and he has already answered. Rather than simply repeating his story, the man takes a bold, brave, and incredibly effective approach. The following verses show how his sincere honesty embarrasses the prejudiced, conniving religious leaders.