151 Samuel said to Saul, "The Lord sent me to anoint you king over his people Israel; now therefore listen to the words of the Lord. 2 Thus says the Lord of hosts, "I will punish the Amalekites for what they did in opposing the Israelites when they came up out of Egypt. 3 Now go and attack Amalek, and utterly destroy all that they have; do not spare them, but kill both man and woman, child and infant, ox and sheep, camel and donkey.' " 4 So Saul summoned the people, and numbered them in Telaim, two hundred thousand foot soldiers, and ten thousand soldiers of Judah. 5 Saul came to the city of the Amalekites and lay in wait in the valley. 6 Saul said to the Kenites, "Go! Leave! Withdraw from among the Amalekites, or I will destroy you with them; for you showed kindness to all the people of Israel when they came up out of Egypt." So the Kenites withdrew from the Amalekites. 7 Saul defeated the Amalekites, from Havilah as far as Shur, which is east of Egypt. 8 He took King Agag of the Amalekites alive, but utterly destroyed all the people with the edge of the sword. 9 Saul and the people spared Agag, and the best of the sheep and of the cattle and of the fatlings, and the lambs, and all that was valuable, and would not utterly destroy them; all that was despised and worthless they utterly destroyed.
Matthew Henry's Commentary on 1 Samuel 15:1-9
Commentary on 1 Samuel 15:1-9
(Read 1 Samuel 15:1-9)
The sentence of condemnation against the Amalekites had gone forth long before, Revelation 18:4. As the commandment had been express, and a test of Saul's obedience, his conduct evidently was the effect of a proud, rebellious spirit. He destroyed only the refuse, that was good for little. That which was now destroyed was sacrificed to the justice of God.