1 Samuel 15:26-35

But Samuel said to him, “I will not go back with you. You have rejected the word of the LORD, and the LORD has rejected you as king over Israel!” As Samuel turned to leave, Saul caught hold of the hem of his robe, and it tore. Samuel said to him, “The LORD has torn the kingdom of Israel from you today and has given it to one of your neighbors—to one better than you. He who is the Glory of Israel does not lie or change his mind; for he is not a human being, that he should change his mind.” Saul replied, “I have sinned. But please honor me before the elders of my people and before Israel; come back with me, so that I may worship the LORD your God.” So Samuel went back with Saul, and Saul worshiped the LORD. Then Samuel said, “Bring me Agag king of the Amalekites.” Agag came to him in chains. And he thought, “Surely the bitterness of death is past.” But Samuel said, “As your sword has made women childless, so will your mother be childless among women.” And Samuel put Agag to death before the LORD at Gilgal. Then Samuel left for Ramah, but Saul went up to his home in Gibeah of Saul. Until the day Samuel died, he did not go to see Saul again, though Samuel mourned for him. And the LORD regretted that he had made Saul king over Israel.