The king said to Doeg, Turn you, and fall on the priests. Doeg the Edomite turned, and he fell on the priests, and he killed on that day eighty-five persons who wore a linen ephod.
So the one escaped to David from the house of Ahimelech, and David felt really responsible for the death of all of those families. He knew that he made a mistake in letting this Doeg go. He should've killed him. "