17Have we not had enough of the sin at Peor from which even yet we have not cleansed ourselves, and for which there came a plague upon the congregation of the LORD,
The sin at Peor refers to the people of Israel offering sacrifices to the gods of Canaan. They were enticed to do so by Moabite women.1 Peor is thus held up as the classic example of apostasy.2
17 Have we not had enough of the sin at Peor from which even yet we have not cleansed ourselves, and for which there came a plague upon the congregation of the LORD,