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Administration of Justice
14“When you enter the land which the Lord your God is giving you, and you take possession of it and live in it, and you say, ‘I will appoint a king over me like all the nations who are around me,’ 15you shall in fact appoint a king over you whom the Lord your God chooses. One from among your countrymen you shall appoint as king over yourselves; you may not put a foreigner over yourselves, anyone who is not your countryman. 16In any case, he is not to acquire many horses for himself, nor shall he make the people return to Egypt in order to acquire many horses, since the Lord has said to you, ‘You shall never again return that way.’ 17And he shall not acquire many wives for himself, so that his heart does not turn away; nor shall he greatly increase silver and gold for himself.
18“Now it shall come about, when he sits on the throne of his kingdom, that he shall write for himself a copy of this Law on a scroll in the presence of the Levitical priests. 19And it shall be with him, and he shall read it all the days of his life, so that he will learn to fear the Lord his God, by carefully following all the words of this Law and these statutes, 20so that his heart will not be haughty toward his countrymen, and that he will not turn away from the commandment to the right or the left, so that he and his sons may live long in his kingdom in the midst of Israel.
Deuteronomy 17:14-20 (NASB)