Deuteronomy 17:14-15

When you have come into the land which the Lord your God is giving you, and have taken it for a heritage and are living in it, if it is your desire to have a king over you, like the other nations round about you; Then see that you take as your king the man named by the Lord your God: let your king be one of your countrymen, not a man of another nation who is not one of yourselves.