What does John 8:10 mean?
Jesus' response to the adulterous woman influences our understanding of judgment, mercy, and God's perspective on sin. At no point does Jesus shrink from the fact of her sin. She was caught "in the act" (John 8:4) so there is no doubt about her moral guilt. Old Testament law called for the death penalty for adulterers (Leviticus 20:10; Deuteronomy 22:22) so there is no doubt about her legal guilt. As the only perfectly sinless man (Hebrews 4:15), there is no doubt about Jesus' moral authority to deliver harsh justice to this sinner.Instead, Jesus demonstrates that simply because we can do something does not make it the best option.
Christ's question here sets up His response in the next verse. This is an instance of forgiveness, not ignorance. Jesus is not going to claim that the woman is innocent or that her sin is trivial. His deflection of the Pharisees was based on procedure: they followed the law incorrectly. Jesus will explicitly refer to her behavior as sinful even as He demonstrates that mercy is meant to take precedence over retribution, even under the Old Testament law (Proverbs 21:10; Zechariah 7:8–9; Matthew 23:23).