Deuteronomy 13:9
but you shall surely kill him. Your hand shall be first on him to put him to death, and afterwards the hands of all the people.
World English Bible (Public Domain)
In context
Before · Deuteronomy 13:7–8
7of the gods of the peoples who are around you, near to you, or far off from you, from the one end of the earth even to the other end of the earth— 8you shall not consent to him nor listen to him; neither shall your eye pity him, neither shall you spare, neither shall you conceal him;
9but you shall surely kill him. Your hand shall be first on him to put him to death, and afterwards the hands of all the people.