Reference for Moed Katan 9:18

א"כ ליכתוב וטמא יקרא מאי וטמא טמא שמעת מינה תרתי

[We might equally ask], who had told us that before Ezekiel came and stated it? Only, that was first learnt by oral tradition and then Ezekiel came and gave us a textual basis for it; here too, it w first learnt as an oral tradition and then Ezekiel came and gave us a textual basis for it.

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