Commentaries:
Barnes' Notes
Utterly destroy - Rather, "devote to destruction" (Leviticus 27:28 note). When a city or people were thus made cherem, everything living was to be destroyed, and no part of the spoil fall to the conquerors (compare I Samuel 15:21). The valuables were put into the sacred treasury.
Other Barnes' Notes entries containing 1 Samuel 15:3:
Deuteronomy 25:13-19
1 Samuel 15:33
1 Samuel 22:19
1 Chronicles 10:13
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