Deuteronomy 13:9-11
9 You must certainly put him to death. Your hand must be the first in putting him to death, and then the hands of all the people.
10 Stone him to death, because he tried to turn you away from the Lord your God, who brought you out of Egypt, out of the land of slavery.
11 Then all Israel will hear and be afraid, and no one among you will do such an evil thing again.