2 Thus says the Lord of hosts, 'I will punish what Am'alek did to Israel in opposing them on the way, when they came up out of Egypt. 3 Now go and smite Am'alek, and utterly destroy all that they have; do not spare them, but kill both man and woman, infant and suckling, ox and sheep, camel and ass.'"
Matthew Henry's Commentary on 1 Samuel 15:2-3
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.