1 Samuel 23:7-9

When it was told Saul that David had come to Keilah, Saul said, “God has delivered him into my hand, for he shut himself in by entering a city with double gates and bars.” So Saul summoned all the people for war, to go down to Keilah to besiege David and his men. Now David knew that Saul was plotting evil against him; so he said to Abiathar the priest, “Bring the ephod here.”