1 Samuel 23:7-9

7Now when Saul was told that David had gone to Keilah, Saul said, “God has delivered him into my hand! For he shut himself in by entering a town with barred gates.”

8So Saul summoned all the troops for battle, to go down to Keilah to besiege David and his fellow men.

9Now David knew that Saul was plotting evil against him, so he said to Abiathar the kohen, “Bring the ephod.”