Leviticus 20:2-3

2“Moreover, you shall say to the children of Israel, ‘Any Israelite or any stranger residing in Israel who gives any of his children to Molech (the god of the Ammonites) [as a human sacrifice] shall most certainly be put to death; the people of the land shall stone him with stones.

3I will also set My face against that man [opposing him, withdrawing My protection from him] and will cut him off from his people [excluding him from the atonement made for them], because he has given some of his children to Molech, so as to defile My sanctuary and profane My holy name.