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

At that time, the Philistines brought their military units together into one army to fight against Israel. So Achish said to David, "You know, of course, that you and your men must march out in the army with me." David replied to Achish, "Good, you will find out what your servant can do." So Achish said to David, "Very well, I will appoint you as my permanent bodyguard."