1 Kings 11:3-7

And he had seven hundred wives, princesses, and three hundred concubines: and his wives turned away his heart.

For it came to pass, when Solomon was old, that his wives turned away his heart after other gods: and his heart was not perfect with the LORD his God, as was the heart of David his father.

For Solomon went after Ashtoreth the goddess of the Zidonians, and after Milcom the abomination of the Ammonites.

And Solomon did evil in the sight of the LORD, and went not fully after the LORD, as did David his father.

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.