1 Samuel 23:5-9

Then David and his men went to Keilah and fought the Philistines; and he drove away their livestock and struck them with a great slaughter. So David saved the inhabitants of Keilah.

Now it came about, when Abiathar the son of Ahimelech fled to David at Keilah, that he came down with an ephod in his hand.

When it was reported to Saul that David had come to Keilah, Saul said, “God has handed him over to me, 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.

But David knew that Saul was plotting evil against him; so he said to Abiathar the priest, “Bring the ephod here.”