1 Samuel 23:6-9

6When Abiathar the son of Ahimelech had fled to David to Keilah, he had come down with an ephod in his hand. 7Now it was told Saul that David had come to Keilah. And Saul said, “God has given him into my hand, for he has shut himself in by entering a town that has gates and bars.” 8And Saul summoned all the people to war, to go down to Keilah, to besiege David and his men. 9David knew that Saul was plotting harm against him. And he said to Abiathar the priest, “Bring the ephod here.”