Numbers 25:16-18 - Vengeance Against The Midianites
16 Then the Lord spoke to Moses: 17 "Bring trouble to the Midianites, and destroy them, 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."