1 Samuel 15:10

He took Agag the king of the Amalekites alive, and utterly destroyed all the people with the edge of the sword.

But Saul and the people spared Agag, and the best of the sheep, and of the cattle, and of the fatlings, and the lambs, and all that was good, and wouldn't utterly destroy them: but everything that was vile and refuse, that they destroyed utterly.

It grieves me that I have set up Saul to be king; for he is turned back from following me, and has not performed my commandments." Samuel was angry; and he cried to Yahweh all night.

Samuel rose early to meet Saul in the morning; and it was told Samuel, saying, "Saul came to Carmel, and behold, he set up a monument for himself, and turned, and passed on, and went down to Gilgal.