4 Bible Verses about Apostasy Of Saul

Samuel said to Saul, "I will not go back with you, for you have rejected the word of the Lord, and the Lord has rejected you from being king over Israel!" When Samuel turned to leave, Saul grabbed the edge of his robe and it tore. Samuel said to him, "The Lord has torn the kingdom of Israel from you this day and has given it to one of your colleagues who is better than you!read more.
The Preeminent One of Israel does not go back on his word or change his mind, for he is not a human being who changes his mind."

So Saul feared David, because the Lord was with him but had departed from Saul.

Samuel said to Saul, "Why have you disturbed me by bringing me up?" Saul replied, "I am terribly troubled! The Philistines are fighting against me and God has turned away from me. He does not answer me -- not by the prophets nor by dreams. So I have called on you to tell me what I should do."

Since you did not obey the Lord and did not carry out his fierce anger against the Amalekites, the Lord has done this thing to you today.