Numbers 25:15, 18

The name of the Midianite woman who was killed was Cozbi the daughter of Zur, who was the tribal head of a father’s household in Midian.

for they harass you with their tricks, the tricks with which they have deceived you in the matter [of the Baal] of Peor, and in the matter of Cozbi, the daughter of the leader of Midian, their sister, who was killed on the day of the plague because [of the Baal] of Peor.”