Deuteronomy 17:14-15

When you enter the land the LORD your God is giving you, taking it as your own and living in it, you will say, “Let’s appoint a king over us like the nations all around us.” Be sure to appoint over you the king the LORD your God chooses. He must be one of your own people. Do not appoint as your king a foreigner who is not a fellow Israelite.