"Then did Solomon build an high place for Chemosh, the
abomination of Moab, in the hill that is before Jerusalem, and for
Molech, the abomination of the children of Ammon."(1 Kings
11:7)
Sacrificing children was not uncommon, but the practice died down
around the time of Jeremiah when the King defiled Tophet, the place
where Moloch was worshipped.
"He also defiled Topheth, which is in the valley of the son of
Hinnom, that no man might make his son or his daughter pass
through the fire for Molech." (2 Kings 23:10)