Leviticus 20:2-5

2“Again, you shall say to the children of Israel: ‘Whoever of the children of Israel, or of the strangers who dwell in Israel, who gives any of his descendants to Molech, he shall surely be put to death. The people of the land shall stone him with stones.

3I will set My face against that man, and will cut him off from his people, because he has given some of his descendants to Molech, to defile My sanctuary and profane My holy name.

4And if the people of the land should in any way hide their eyes from the man, when he gives some of his descendants to Molech, and they do not kill him,

5then I will set My face against that man and against his family; and I will cut him off from his people, and all who prostitute themselves with him to commit harlotry with Molech.