Бамидбар 8:7 Комментарий: Rashi, Rashbam, Rabbeinu Bahya & Chizkuni

הזה עליהם מי חטאת SPRINKLE UPON THEM WATER OF PURIFYING — water in which the ashes of the Red Heifer are mingled; on account of those among them who might have become unclean through contact with dead persons.

והעבירו, the vocalisation ve-he-eviru means that it is a modified version of the future tense known as vav hahipuch, the letter ו reversing the tense. Had the vocalisation been veha-aviru it would have been an imperative mode, just as in Exodus 8,4 העתירו אל ה', “plead with the Lord!”

וכה תעשה להם לטהרם הזה עליהם מי חטאת, “so you shall do to them to purify them.” The מי חטאת refers to the ash of the red heifer. The need for this was due to people who had been contaminated through contact with the dead of the people who had been executed due to their involvement in worshipping the golden calf. At the time Moses had issued instructions to the Levites to kill the guilty persons even if they were close relatives of the Levites (Exodus 32,27).

והעבירו תער AND LET THEM SHAVE [ALL THEIR FLESH] — I have found in the work of R. Moses the Preacher the following: Because they were made propitiatory substitutes for the firstborn who had worshipped the idol (the Golden Calf), and it (idolatry) is called (Psalms 106:28) “offerings to the dead”, and the leper is also called dead (cf. Numbers 12:12), it (Scripture) requires them to shave their body like lepers.