1SA 18:25

25 Saul replied, “Go and say to David, ‘[In order for ] the king [to allow you to marry Michal, he] wants [you to kill] 100 Philistines [and cut off] their foreskins [and bring the foreskins to him to prove that you have killed them]. In that way he will get revenge on his enemies.’ ” But what Saul wanted was that the Philistines would kill David [while David was trying to kill them].