Thematic Bible: Is refused permission to accompany the philistines to battle against the israelites

And it came to pass in those days, that the Philistines gathered their armies together for warfare, to fight against Israel. And Achish said unto David, Know for certain, that thou shalt go out with me to battle, thou and thy men. And David said to Achish, Surely thou shalt know what thy slave can do. And Achish said to David, Therefore, I will make thee keeper of my head all the days.