'Foreskins' in the Bible

Joshua made himself flint knives, and circumcised the children of Israel at the hill of the foreskins.

Saul said, "You shall tell David, 'The king desires no dowry except one hundred foreskins of the Philistines, to be avenged of the king's enemies.'" Now Saul thought to make David fall by the hand of the Philistines.

and David arose and went, he and his men, and killed of the Philistines two hundred men; and David brought their foreskins, and they gave them in full number to the king, that he might be the king's son-in-law. Saul gave him Michal his daughter as wife.

David sent messengers to Ishbosheth, Saul's son, saying, "Deliver me my wife Michal, whom I pledged to be married to me for one hundred foreskins of the Philistines."

Circumcise yourselves to Yahweh, and take away the foreskins of your heart, you men of Judah and inhabitants of Jerusalem; lest my wrath go forth like fire, and burn so that none can quench it, because of the evil of your doings.