Numbers 25:16-18

25:16 Then the Lord spoke to Moses: 25:17 “Bring trouble to the Midianites, and destroy them, 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.”