And Balak took Balaam to the top of Peor, that looks down upon the desert.

And Israel joined himself to Baal-peor, and the anger of LORD was kindled against Israel.

And Moses said to the judges of Israel, Kill ye every one his men who have joined themselves to Baal-peor.

for they vex you with their wiles, with which they have beguiled you in the matter of Peor, and in the matter of Cozbi, the daughter of the ruler of Midian, their sister, who was slain on the day of the plague in the matter of Peor

Behold, these caused the sons of Israel, through the counsel of Balaam, to commit trespass against LORD in the matter of Peor, and so the plague was among the congregation of LORD.