Deuteronomy 17:15

and they said to him, “Behold, you have grown old, and your sons do not walk in your ways. Now appoint a king for us to judge us like all the nations.”

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.

And Samuel said to all the people, “Do you see him whom Yahweh has chosen? Surely there is no one like him among all the people.” So all the people shouted and said, “Long live the king!”

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 invite Jesse to the sacrifice, and I will make you know what you shall do; and you shall anoint for Me the one whom I say to you.”