1 Samuel 8:9

Yahweh said to Samuel, "Listen to the voice of the people in all that they tell you; for they have not rejected you, but they have rejected me, that I should not be king over them.

According to all the works which they have done since the day that I brought them up out of Egypt even to this day, in that they have forsaken me, and served other gods, so do they also to you.

Samuel told all the words of Yahweh to the people who asked of him a king.

He said, "This will be the way of the king who shall reign over you: he will take your sons, and appoint them to him, for his chariots, and to be his horsemen; and they shall run before his chariots;