Reference for Moed Katan 9:19

אביי אמר מהכא (ויקרא יט, יד) ולפני עור לא תתן מכשול רב פפא אמר (ישעיהו נז, יד) ואמר סלו סלו פנו דרך

R'Abbahu suggested that it may be derived from this [text]: And he shall cry, 'Unclean! Unclean!'<span class="x" onmousemove="('comment',' The leper, in his state of uncleanness, shall warn those who approach him. Lev. XIII, 45.');">¹⁴</span> [That is], impurity cries out [t the passer-by] and tells him, 'Keep off!' And R''Uzziel, the grandson of the elder R''Uzziel said the same, [that] impurity cries out and tells him, 'Keep off!' But was this [text] intended for this lesson?

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