Numbers 25:1-3

While the Israelites were camped at Acacia Grove, some of the men defiled themselves by having sexual relations with local Moabite women. These women invited them to attend sacrifices to their gods, so the Israelites feasted with them and worshiped the gods of Moab. In this way, Israel joined in the worship of Baal of Peor, causing the Lord’s anger to blaze against his people.