Reference for Niddah 66:21

אלמא מספיקא לא שרפינן תרומה ורמינהי

and came to R. Shimi b. Ashi the latter said to him: Why did you not answer him [that our Mishnah<span class="x" onmousemove="('comment',' According to which terumah is not burnt on account of its contact with a couch that was underneath a Samaritan. ');">²¹</span>

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