1 Kings 11:7

11:7 Furthermore, on the hill east of Jerusalem Solomon built a high place for the detestable Moabite god Chemosh and for the detestable Ammonite god Milcom.

Nehemiah 13:26

13:26 Was it not because of things like these that King Solomon of Israel sinned? Among the many nations there was no king like him. He was loved by his God, and God made him king over all Israel. But the foreign wives made even him sin!