Reference for Shabbat 100:14

לא לעולם דלא נתקלקלה והכא בחוששין קמיפלגי מר סבר חוששין שמא נתקלקלה הגומא ומר סבר אין חוששין

Amemar and R. Ashi washed [their hands therewith]; Mar Zutra did not. Said they to him, Do you not accept R. Shesheth's ruling that barda is permitted? R. Mordecai answered them: Exclude the Master [Mar Zutra], who does not hold it [permitted] even on weekdays. His view is as what was taught: One may scrape off the dirt scabs and wound scabs that are on his flesh because of the pain;<span class="x" onmousemove="('comment',' Which their presence causes him. ');">¹³</span>

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