Deuteronomy 13:9-11

You must put them to death. You must be the first one to start to kill them, and then everyone else must join in. You must throw stones at them until they die, because they tried to turn you away from the LORD your God, who brought you out of the land of Egypt, where you were slaves. Then everyone in Israel will hear about this and be afraid, and no one among you will ever do such an evil thing again.