Numbers 25:14-15

25:14 Now the name of the Israelite who was stabbed – the one who was stabbed with the Midianite woman – was Zimri son of Salu, a leader of a clan of the Simeonites. 25:15 The name of the Midianite woman who was killed was Cozbi daughter of Zur. He was a leader over the people of a clan of Midian.

Numbers 25:18

25:18 because they bring trouble to you by their treachery with which they have deceived you in the matter of Peor, and in the matter of Cozbi, the daughter of a prince of Midian, their sister, who was killed on the day of the plague that happened as a result of Peor.”