Shmuel Alef 22:17

And HaMelech said unto the footmen that stood about him, Turn, and slay the Kohanim of HASHEM; because their yad also is with Dovid, and because they knew when he fled, and did not reveal it in my ear. But the avadim of HaMelech would not put forth their yad to strike the Kohanim of HASHEM.