John 8:3

3. As he was speaking, the teachers of religious law and Pharisees brought a woman they had caught in the act of adultery. They put her in front of the crowd.
4. "Teacher," they said to Jesus, "this woman was caught in the very act of adultery.
5. The law of Moses says to stone her. What do you say?"
6. They were trying to trap him into saying something they could use against him, but Jesus stooped down and wrote in the dust with his finger.
7. They kept demanding an answer, so he stood up again and said, "All right, stone her. But let those who have never sinned throw the first stones!"