1 Samuel 28:1-2

World English Bible

28 In those days, the Philistines gathered their armies together for warfare, to fight with Israel. Achish said to David, “Know assuredly that you will go out with me in the army, you and your men.”

² David said to Achish, “Therefore you will know what your servant can do.”

Achish said to David, “Therefore I will make you my bodyguard forever.”