Deuteronomy 17:18

And he said, “This will be the custom of the king who will reign over you: he will take your sons and appoint them for himself in his chariots and among his horsemen, and they will run before his chariots.

Then Samuel spoke with the people about the legal judgments of the kingdom and wrote them in the book and placed it before Yahweh. And Samuel sent all the people away, each one to his house.

“And you shall keep the responsibility given by Yahweh your God, to walk in His ways, to keep His statutes, His commandments, His judgments, and His testimonies, according to what is written in the Law of Moses, that you may be prosperous in all that you do and wherever you turn,