Numbers 25:6-8, 14-15

Then behold, one of the sons of Israel came and brought to his relatives a Midianite woman, in the sight of Moses and in the sight of all the congregation of the sons of Israel, while they were weeping at the doorway of the tent of meeting. When Phinehas the son of Eleazar, the son of Aaron the priest, saw it, he arose from the midst of the congregation and took a spear in his hand, and he went after the man of Israel into the tent and pierced both of them through, the man of Israel and the woman, through the body. So the plague on the sons of Israel was checked.

Now the name of the slain man of Israel who was slain with the Midianite woman, was Zimri the son of Salu, a leader of a father’s household among the Simeonites. The name of the Midianite woman who was slain was Cozbi the daughter of Zur, who was head of the people of a father’s household in Midian.