7 And Saul defeated the Amalekites from Havilah as far as Shur, which is east of Egypt. 8 And he took Agag the king of the Amalekites alive and devoted to destruction all the people with the edge of the sword. 9 But Saul and the people spared Agag and the best of the sheep and of the oxen and of the fattened calves[1] and the lambs, and all that was good, and would not utterly destroy them. All that was despised and worthless they devoted to destruction.

10 The word of the Lord came to Samuel: 11 "I regret that I have made Saul king, for he has turned back from following me and has not performed my commandments." And Samuel was angry, and he cried to the Lord all night.

Matthew Henry's Commentary on 1 Samuel 15:7-11

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.

Commentary on 1 Samuel 15:10-23

(Read 1 Samuel 15:10-23)

Repentance in God is not a change of mind, as it is in us, but a change of method. The change was in Saul; "He is turned back from following me." Hereby he made God his enemy. Samuel spent a whole night in pleading for Saul. The rejection of sinners is the grief of believers: God delights not in their death, nor should we. Saul boasts to Samuel of his obedience. Thus sinners think, by justifying themselves, to escape being judged of the Lord. The noise the cattle made, like the rust of the silver, James 5:3, witnessed against him. Many boast of obedience to the command of God; but what means then their indulgence of the flesh, their love of the world, their angry and unkind spirit, and their neglect of holy duties, which witness against them? See of what evil covetousness is the root; and see what is the sinfulness of sin, and notice that in it which above any thing else makes it evil in the sight of the Lord; it is disobedience: "Thou didst not obey the voice of the Lord." Carnal, deceitful hearts, like Saul, think to excuse themselves from God's commandments by what pleases themselves. It is hard to convince the children of disobedience. But humble, sincere, and conscientious obedience to the will of God, is more pleasing and acceptable to him than all burnt-offering and sacrifices. God is more glorified and self more denied, by obedience than by sacrifice. It is much easier to bring a bullock or lamb to be burned upon the altar, than to bring every high thought into obedience to God, and to make our will subject to his will. Those are unfit and unworthy to rule over men, who are not willing that God should rule over them.