1 Samuel 18:12-16, 28-30

Now Saul was afraid of David, for the LORD was with him but had departed from Saul. Therefore Saul removed him from his presence and appointed him as his commander of a thousand; and he went out and came in before the people. David was prospering in all his ways for the LORD was with him. When Saul saw that he was prospering greatly, he dreaded him. But all Israel and Judah loved David, and he went out and came in before them.

When Saul saw and knew that the LORD was with David, and that Michal, Saul’s daughter, loved him, then Saul was even more afraid of David. Thus Saul was David’s enemy continually. Then the commanders of the Philistines went out to battle, and it happened as often as they went out, that David behaved himself more wisely than all the servants of Saul. So his name was highly esteemed.