Numbers 25:16-18

16The Lord said to Moses,

17‘Attack the Midianites and destroy them.

18They have deceived you and they have become your enemies. They took some of you to worship their god Peor. They used Cozbi to make you do a wrong thing, and she was the daughter of a Midianite leader. Phinehas killed her on the day when the bad disease killed many Israelites at Peor mountain.’