Shemu’ĕl Aleph (1 Samuel) 29:4

But the princes of the Philistines were wroth with him, and the princes of the Philistines said to him, “Send the man back, let him return to the place which you have appointed for him, and do not let him go down with us to battle, lest in the battle he become our adversary. For with what could he appease his master, if not with the heads of these men?