4 Bible Verses about Apostasy Of Saul

And Samuel said to Saul, "I will not return with you. For you have rejected the word of the LORD, and the LORD has rejected you from being king over Israel." As Samuel turned to go away, Saul seized the skirt of his robe, and it tore. And Samuel said to him, "The LORD has torn the kingdom of Israel from you this day and has given it to a neighbor of yours, who is better than you.read more.
And also the Glory of Israel will not lie or have regret, for he is not a man, that he should have regret."

Saul was afraid of David because the LORD was with him but had departed from Saul.

Then Samuel said to Saul, "Why have you disturbed me by bringing me up?" Saul answered, "I am in great distress, for the Philistines are warring against me, and God has turned away from me and answers me no more, either by prophets or by dreams. Therefore I have summoned you to tell me what I shall do."

Because you did not obey the voice of the LORD and did not carry out his fierce wrath against Amalek, therefore the LORD has done this thing to you this day.