Deuteronomy 17:18

And when he sits on the throne of his kingdom , he shall write for himself in a book a copy of this law , approved by the Levitical priests .

When he takes the throne of his kingdom, he is to write for himself on a scroll a copy of this law, taken from that of the Levitical priests.

And it shall be, when he sitteth upon the throne of his kingdom, that he shall write him a copy of this law in a book out of that which is before the priests the Levites :