Leviticus 20:2-5

2“Moreover, you are to tell Bnei-Yisrael: Anyone from Bnei-Yisrael or from the outsiders dwelling in Israel, who gives any of his children to Molech, should surely be put to death. The people of the land are to stone him with rocks.

3I also will set My face against such a person and will cut him off from among his people, because he has given his children to Molech, defiling My Sanctuary and profaning My holy Name.

4But if the people of the land all hide their eyes from that person, when he gives of his seed to Molech, and do not put him to death,

5then I will set My face against that man and against his family, and will cut him off, along with all who play the prostitute after him with Molech, from among their people.