Then the word of the LORD came to Samuel, saying,
God does not change His mind as we do; He wills an alteration in His method when the creature turns away. Saul turned back from following Him through covetousness and partial obedience, and made himself God's enemy. Samuel spent the whole night wrestling with God in prayer for Saul's restoration, grieving not for himself but that any sinner should forfeit God's favor.
AI summary
Commenting on 1 Samuel 15:10-23
Then came the word of the Lord unto Samuel,.... The word of prophecy, as the Targum; this came to him in a dream or vision, or by an articulate voice: saying; as follows.
GOD REJECTS HIS FOR DISOBEDIENCE. (Sa1 15:10-11) Then came the word of the Lord unto Samuel, saying, It repenteth me that I have set up Saul--Repentance is attributed in Scripture to Him when bad men give Him cause to alter His course and method of procedure, and to treat them as if He did "repent" of kindness shown.