Commentary for Niddah 39:77
תלתא דרי ותלתא טרפן הויין נקוט דרא מציעאה וטרפא מציעתא בידך
R. Hanina used to break up a piece of potter's clay and thereby performed the examination. R. Ishmael son of R. Jose cursed with croup any other person who adopts such a method
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