Deuteronomy 13:9-11

But you shall surely kill him; your hand shall be first against him to put him to death, and afterwards the hand of all the people. So you shall stone him to death because he has sought to seduce you from the LORD your God who brought you out from the land of Egypt, out of the house of slavery. Then all Israel will hear and be afraid, and will never again do such a wicked thing among you.