1 Samuel 18:12-16, 28-30

Saul was afraid of David, because the LORD was with David but had departed from Saul. So he sent David away from him and gave him command over a thousand men, and David led the troops in their campaigns. In everything he did he had great success, because the LORD was with him. When Saul saw how successful he was, he was afraid of him. But all Israel and Judah loved David, because he led them in their campaigns.

When Saul realized that the LORD was with David and that his daughter Michal loved David, Saul became still more afraid of him, and he remained his enemy the rest of his days. The Philistine commanders continued to go out to battle, and as often as they did, David met with more success than the rest of Saul’s officers, and his name became well known.