18 Because you didn't obey the voice of Yahweh, and didn't execute his fierce wrath on Amalek, therefore Yahweh has done this thing to you this day.
*Minor differences ignored. Grouped by changes, with first version listed as example.
Nor executedst his fierce wrath upon Amalek - See 1-Samuel 15:1-9 (note) and the notes there.
Because thou obeyedst not the voice of the Lord,.... At Gilgal, as Abarbinel thinks; which is the first thing for which the kingdom was threatened to be taken from him, 1-Samuel 13:13,
nor executedst his fierce wrath upon Amalek: in sparing Agag, and the best of the cattle, 1-Samuel 15:9,
therefore hath the Lord done this thing unto thee this day; forsaken him, rent his kingdom from him, and would deliver him into the hands of the Philistines, as follows: had he been the true Samuel, he would have told him of some other sins of his, provoking to the Lord; as his slaughter of the priests at Nob, his cruel persecution of David, and especially of his asking counsel of one that had a familiar spirit at this time, of which not a word is said, and yet was the very transgression for which Saul died, 1-Chronicles 10:13.
*More commentary available at chapter level.