1 Kings 11:2-4

11:2 They came from nations about which the Lord had warned the Israelites, “You must not establish friendly relations with them! If you do, they will surely shift your allegiance to their gods.” But Solomon was irresistibly attracted to them.

11:3 He had 700 royal wives and 300 concubines; his wives had a powerful influence over him. 11:4 When Solomon became old, his wives shifted his allegiance to other gods; he was not wholeheartedly devoted to the Lord his God, as his father David had been.