Deuteronomy 17:2-7

²“When you begin living in the towns the Lord your God is giving you, a man or woman among you might do evil in the sight of the Lord your God and violate the covenant. ³For instance, they might serve other gods or worship the sun, the moon, or any of the stars—the forces of heaven—which I have strictly forbidden. ⁴When you hear about it, investigate the matter thoroughly. If it is true that this detestable thing has been done in Israel, ⁵then the man or woman who has committed such an evil act must be taken to the gates of the town and stoned to death. ⁶But never put a person to death on the testimony of only one witness. There must always be two or three witnesses. ⁷The witnesses must throw the first stones, and then all the people may join in. In this way, you will purge the evil from among you.