Deuteronomy 17:14; Deuteronomy 17:18

14 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;

18 And when he has taken his place on the seat of his kingdom, he is to make in a book a copy of this law, from that which the priests, the Levites, have in their care: