Jamieson-Fausset-Brown Bible Commentary

he took Agag . . . alive--This was the common title of the Amalekite kings. He had no scruple about the apparent cruelty of it, for he made fierce and indiscriminate havoc of the people. But he spared Agag, probably to enjoy the glory of displaying so distinguished a captive, and, in like manner, the most valuable portions of the booty, as the cattle. By this wilful and partial obedience to a positive command [Sa1 15:3], complying with it in some parts and violating it in others, as suited his own taste and humor, Saul showed his selfish, arbitrary temper, and his love of despotic power, and his utter unfitness to perform the duties of a delegated king in Israel.