1 Samuel 15:26-35

But Samuel said to Saul, “I will not return with you; for you have rejected the word of the LORD, and the LORD has rejected you from being king over Israel.” As Samuel turned to go, Saul seized the edge of his robe, and it tore. So Samuel said to him, “The LORD has torn the kingdom of Israel from you today and has given it to your neighbor, who is better than you. Also the Glory of Israel will not lie or change His mind; for He is not a man that He should change His mind.” Then he said, “I have sinned; but please honor me now before the elders of my people and before Israel, and go back with me, that I may worship the LORD your God.” So Samuel went back following Saul, and Saul worshiped the LORD. Then Samuel said, “Bring me Agag, the king of the Amalekites.” And Agag came to him cheerfully. And Agag said, “Surely the bitterness of death is past.” But Samuel said, “As your sword has made women childless, so shall your mother be childless among women.” And Samuel hewed Agag to pieces before the LORD at Gilgal. Then Samuel went to Ramah, but Saul went up to his house at Gibeah of Saul. Samuel did not see Saul again until the day of his death; for Samuel grieved over Saul. And the LORD regretted that He had made Saul king over Israel.