1 Samuel 23:7-9

7Saul was told that David had gone to Keilah, and he said, “God has delivered him into my hands, for David has imprisoned himself by entering a town with gates and bars.”

8And Saul called up all his forces for battle, to go down to Keilah to besiege David and his men.

9When David learned that Saul was plotting against him, he said to Abiathar the priest, “Bring the ephod.”