Deuteronomy 17:18 MSG

[18] This is what must be done: When he sits down on the throne of his kingdom, the first thing he must do is make himself a copy of this Revelation on a scroll, copied under the supervision of the Levitical priests. That scroll is to remain at his side at all times; he is to study it every day so that he may learn what it means to fear his God, living in reverent obedience before these rules and regulations by following them. He must not become proud and arrogant, changing the commands at whim to suit himself or making up his own versions. If he reads and learns, he will have a long reign as king in Israel, he and his sons.