Shmuel Alef 28:1-2

Orthodox Jewish Bible

28 And it came to pass in those yamim, that the Pelishtim gathered their machanot together for tzava (warfare), to fight with Yisroel. And Achish said unto Dovid, Know thou assuredly, that thou shalt go out with me to machaneh, thou and thy anashim.

² And Dovid said to Achish, Surely thou shalt know what thy eved will do. And Achish said to Dovid, Therefore will I make thee my shomer rosh (head bodyguard) kol hayamim.