1 Samuel 23:7-9

7When Saul was told that David had come to Keilah, Saul said, “God has delivered him into my hand, for he has boxed himself into a corner by entering a city with two barred gates.”

8So Saul mustered all his army to go down to Keilah and besiege David and his men.

9When David realized that Saul was planning to harm him, he told Abiathar the priest, “Bring the ephod!”