And he took Agag the king of the Amalekites alive,.... This name seems to be a common name of the kings of these people, as Pharaoh was of the Egyptians, see Numbers 24:2. When this king fell into the hands of Saul, he did not put him to death, as he should have done, but preserved him; for what reasons, see in the following verse:
and utterly destroyed all the people with the edge of the sword; that is, all that came in his way, or fell into his hands; all between Havilah and Shur; all excepting those that made their escape, for we after read of Amalekites, and that in large bodies, 1 Samuel 27:8.