In those days the Philistines gathered their troops ¹  for war in order to fight Israel. Achish said to David, “You should fully understand that you and your men must go with me into the battle.” ² 

David replied to Achish, “That being the case, you will come to know what your servant can do!” Achish said to David, “Then I will make you my bodyguard ¹  from now on.” ²