Leviticus 20:1

Moreover, you shall tell the children of Israel, 'Anyone of the children of Israel, or of the strangers who live as foreigners in Israel, who gives any of his seed to Molech; he shall surely be put to death. The people of the land shall stone him with stones.

I also will set my face against that person, and will cut him off from among his people because he has given of his seed to Molech, to defile my sanctuary, and to profane my holy name.