Reference for Zevachim 203:2

קתני מיהת משה זר ואין זר רואה את הנגעים

Rather, the Holy One, blessed be He, bestowed great honour upon Miriam in that moment, and declared, I am a priest: I will shut her away, I will declare her a definite [leper], and I will free her. He teaches at all events, 'Moses was a zar and a zar cannot inspect plagues'? - Said R'Nahman B'Isaac: The inspection of leprosy<span class="x" onmousemove="('comment',' Lit., 'the appearance of plagues'.');">²</span>

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