1 Kings 11:4-8

4For when Solomon grew old, his wives turned his heart after other gods, and he was not wholeheartedly devoted to the LORD his God, as his father David had been. 5Solomon followed Ashtoreth the goddess of the Sidonians and Milcom1 the abomination of the Ammonites. 6So Solomon did evil in the sight of the LORD; unlike his father David, he did not follow the LORD completely.

7At that time on a hill east of Jerusalem, Solomon built a high place for Chemosh the abomination of Moab and for Molech the abomination of the Ammonites. 8He did the same for all his foreign wives, who burned incense and sacrificed to their gods.