1 Samuel 8:8-12

Like all the deeds which they have done since the day that I brought them up from Egypt even to this day—in that they have abandoned Me and served other gods—so they are doing to you as well.

Now then, listen to their voice; however, you shall warn them strongly and tell them of the practice of the king who will reign over them.” Warning concerning a King

So Samuel spoke all the words of the Lord to the people who had asked him for a king.

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

He will appoint for himself commanders of thousands and commanders of fifties, and some to do his plowing and to gather in his harvest, and to make his weapons of war and equipment for his chariots.