25 Saul replied, “Say to David, ‘The king wants no other price for the bride than a hundred Philistine foreskins, to take revenge on his enemies.’ ” Saul’s plan was to have David fall by the hands of the Philistines.

Read 1 Samuel 18:25 Using Other Translations

And Saul said, Thus shall ye say to David, The king desireth not any dowry, but an hundred foreskins of the Philistines, to be avenged of the king's enemies. But Saul thought to make David fall by the hand of the Philistines.
Then Saul said, "Thus shall you say to David, 'The king desires no bride-price except a hundred foreskins of the Philistines, that he may be avenged of the king's enemies.'"Now Saul thought to make David fall by the hand of the Philistines.
he told them, “Tell David that all I want for the bride price is 100 Philistine foreskins! Vengeance on my enemies is all I really want.” But what Saul had in mind was that David would be killed in the fight.