The teachers of the law and the Pharisees brought in a woman caught in adultery. They made her stand before the group and said to Jesus, "Teacher, this woman was caught in the act of adultery. In the Law Moses commanded us to stone such women. Now what do you say?" They were using this question as a trap in order to have a basis for accusing him.
But Jesus bent down and started writing on the ground with his finger. When they kept questioning him, he straightened up and said to them, "If any one of you is without sin, let him be the first to throw a stone at her."
(John 8:3-7, NIV)