The Pharisees were being selective with the Law here. Deuteronomy 22:22 says, “If a man is found lying with the wife of another man, both of them shall die.” Where’s the man? It takes two to commit adultery. The Pharisees were trying to appear just and upright but their obvious mishandling of the law was revealing their evil motives. They were not concerned about justice. They were not concerned about the holiness of God. They simply wanted to get rid of Jesus who was exposing their hypocritical life.