1Sa 15:20
“Yea, I have hearkened to the voice of Jehovah (אשׁר serving, like כּי ekil , to introduce the reply: here it is used in the sense of asseveration, utique, yea), and have brought Agag the king of the Amalekites, and banned Amalek.” Bringing Agag he mentioned probably as a practical proof that he had carried out the war of extermination against the Amalekites.