1 Samuel 15-16, Psalms 88

The Lord sends Samuel to tell King Saul that he is to wipe out the Amalekites completely, because they opposed Israel when God brought them out of Egypt. King Saul decides that he will wipe out everyone and everything, except for King Agag of the Amalekites, and, you know, all the good stuff. You can’t destroy the good stuff, right? Because of this disobedience, the Lord tells Samuel that he regrets making Saul king. Samuel rebukes King Saul, and proceeds to take care of business where Saul failed to do so. After this, the Lord sends Samuel to Jesse of Bethlehem, because he has selected one of his sons to be king in Saul’s place.