1 Samuel 23:7-9

Now when Saul was informed that David had come to Keilah, Saul said, “God has handed him over to me, for he shut himself in by entering a city that has double gates and bars.” So Saul summoned all the people (soldiers) for war, to go down to Keilah to besiege David and his men. But David knew that Saul was plotting evil against him; and he said to Abiathar the priest, “Bring the ephod here.”