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וידבר ה׳ אל משה ואל אהרן. בעבור שהוא הכהן המורה המבדיל בין הטמא ובין הטהור: AND THE LORD SPOKE UNTO MOSES AND TO AARON. For Aaron is the kohen who teaches and who differentiates between the unclean and the clean.1Aaron teaches Israel how to differentiate between the unclean and unclean. Hence God’s word was also directed to Aaron.