Reference for Bava Kamma 49:9
א"ל רב פפא לאביי הא האי תנא דלא דריש דיו ואע"ג דלא מפריך ק"ו דתניא קרי בזב מניין ודין הוא מה טהור בטהור טמא בטמא טמא בטהור אינו דין שיהא טמא בטמא
[decreasing the number of days to seven]. And the Rabbis? — They argue that this is expressed in the further verse: And Miriam was shut out from the camp.<span class="x" onmousemove="('comment',' Num. XII, 15. ');"><sup>16</sup></span> And R. Tarfon? — He maintains that the additional statement was intended to introduce the principle of <i>Dayyo</i> for general application so that you should not suggest limiting its working only to that case where the dignity of Moses was involved, excluding thus its acceptance for general application: it has therefore been made known to us [by the additional statement] that this is not the case.