1 Kings 11:4-9

In Solomon’s old age, they turned his heart to worship other gods instead of being completely faithful to the LORD his God, as his father, David, had been. Solomon worshiped Ashtoreth, the goddess of the Sidonians, and Molech, the detestable god of the Ammonites. In this way, Solomon did what was evil in the LORD’s sight; he refused to follow the LORD completely, as his father, David, had done. On the Mount of Olives, east of Jerusalem, he even built a pagan shrine for Chemosh, the detestable god of Moab, and another for Molech, the detestable god of the Ammonites. Solomon built such shrines for all his foreign wives to use for burning incense and sacrificing to their gods. The LORD was very angry with Solomon, for his heart had turned away from the LORD, the God of Israel, who had appeared to him twice.