Deuteronomy 17:14-15

14“When you enter the land which the Lord your God is giving you, and you take possession of it and live there, and you say, ‘I will set a king over me like all the nations who are around me,’

15you shall most certainly set a king over you whom the Lord your God chooses. You shall set a king over you from among your countrymen (brothers); you may not choose a foreigner [to rule] over you who is not your countryman.