for they, too, have behaved with hostility against you, and they have deceived you insidiously by means of the idol Peor, and by Cozbi, the daughter of a commander of Midian, their sister, who was struck down in the day of the scourge because of the sacrilege of Peor.
Other versions
King James Version
For they vex you with their wiles, wherewith they have beguiled you in the matter of Peor, and in the matter of Cozbi, the daughter of a prince of Midian, their sister, which was slain in the day of the plague for Peor's sake.English Standard Version
for they have harassed you with their wiles, with which they beguiled you in the matter of Peor, and in the matter of Cozbi, the daughter of the chief of Midian, their sister, who was killed on the day of the plague on account of Peor."New International Version
because they treated you as enemies when they deceived you in the affair of Peor and their sister Cozbi, the daughter of a Midianite leader, the woman who was killed when the plague came as a result of Peor."