Deuteronomy 17:15-17

New Revised Standard Version, Anglicised Catholic Edition

¹⁵ you may indeed set over you a king whom the Lord your God will choose. One of your own community you may set as king over you; you are not permitted to put a foreigner over you, who is not of your own community. ¹⁶ Even so, he must not acquire many horses for himself, or return the people to Egypt in order to acquire more horses, since the Lord has said to you, ‘You must never return that way again.’ ¹⁷ And he must not acquire many wives for himself, or else his heart will turn away; also silver and gold he must not acquire in great quantity for himself.