Numbers 25:14-18
14 The name of the Israelite who was killed with the Midianite woman was Zimri son of Salu, the leader of a Simeonite family.
15 And the name of the Midianite woman who was put to death was Cozbi daughter of Zur, a tribal chief of a Midianite family.
16 The Lord said to Moses,
17 “Treat the Midianites as enemies and kill them,
18 because they treated you as enemies when they deceived you in the affair of Peor and their sister Cozbi, the daughter of a Midianite leader, the woman who was killed when the plague came as a result of Peor.”