Deuteronomy 17:18-19

18When anyone starts to rule as king, he must copy this Law of God on a scroll. The scroll will be a copy of the one that belongs to the Levite priests.

19He must keep this scroll with him all the time. He must continue to read it every day of his life. If he does that, he will learn to respect the Lord his God. He will learn to obey all the rules and commands of this Law.