I Samuel 23:7-9

And Saul was told that David had gone to Keilah. So Saul said, “God has delivered him into my hand, for he has shut himself in by entering a town that has gates and bars.” Then Saul called all the people together for war, to go down to Keilah to besiege David and his men. When David knew that Saul plotted evil against him, he said to Abiathar the priest, “Bring the ephod here.”