John Wesley on 1 Samuel 15:11

Repenteth - Repentance implies grief of heart, and change of counsels, and therefore cannot be in God: but it is ascribed to God when God alters his method of dealing, and treats a person as if be did indeed repent of the kindness he had shewed him. All night - To implore his pardoning mercy for Saul, and for the people. Is turned back - Therefore he did once follow God. Otherwise it would have been impossible, he should turn back from following him.