2 Samuel 3:14

And David sent messengers to Ish–bosheth Saul’s son, saying, Deliver me my wife Michal, which I espoused to me for an hundred foreskins of the Philistines.

Cross-reference

In 1 Samuel 18:25, Saul demanded a hundred Philistine foreskins as bride price—the exact condition David now invokes to reclaim Michal.

1 Samuel 18:27 Historical context

In 1 Samuel 18:27, David killed 200 Philistines and brought their foreskins, fulfilling the bride-price—proving his right to Michal.

1 Samuel 25:44 Historical context

In 1 Samuel 25:44, Saul gave Michal to Paltiel, taking her from David—this explains why David must demand her return.