Deuteronomy 17:14-15

14“When you enter the land which the Lord your God gives you, and you 1possess it and live in it, and you say, ‘2I will set a king over me like all the nations who are around me,’

15you shall surely set a king over you whom the Lord your God chooses, one 3from among your 4countrymen you shall set as king over yourselves; you may not put a foreigner over yourselves who is not your 5countryman.