Bamidbar 25:16-18 Orthodox Jewish Bible (OJB)
16 And Hashem spoke unto Moshe, saying,
17 Be hostile toward the Midyanim, and strike them;
18 For they are hostile toward you with their wiles, wherewith they have beguiled you in the matter of Peor, and in the matter of Kozbi bat Nasi Midyan, their achot, which was slain in the yom of the maggefah that resulted from Peor.
Numbers 25:16-18 New International Version (NIV)
16 The Lord said to Moses, 17 “Treat the Midianites as enemies and kill them. 18 They treated you as enemies when they deceived you in the Peor incident involving their sister Kozbi, the daughter of a Midianite leader, the woman who was killed when the plague came as a result of that incident.”