So Balak took Balaam to the top of Peor which overlooks the wasteland.

So Israel joined themselves to Baal of Peor, and the Lord was angry against Israel.

So Moses said to the judges of Israel, “Each of you slay his men who have joined themselves to Baal of Peor.”

for they have been hostile to you with their tricks, with which they have deceived you in the affair of Peor and in the affair of Cozbi, the daughter of the leader of Midian, their sister who was slain on the day of the plague because of Peor.”

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