Numbers 25:6-8, 14-15

An Israelite man came bringing a Midianite woman to his relatives in the sight of Moses and the whole Israelite community while they were weeping at the entrance to the tent of meeting. When Phinehas son of Eleazar, son of Aaron the priest, saw this, he got up from the assembly, took a spear in his hand, followed the Israelite man into the tent,  and drove it through both the Israelite man and the woman — through her belly. Then the plague on the Israelites was stopped,

The name of the slain Israelite man, who was struck dead with the Midianite woman, was Zimri son of Salu, the leader of a Simeonite family.  The name of the slain Midianite woman was Cozbi, the daughter of Zur, a tribal head of a family in Midian.