Commentary for Niddah 40:54
והתניא
R. Ammi b. Samuel ruled: All kinds of blood must be examined only between the sunlight and the shade. R. Nahman citing Rabbah b. Abbuha ruled: The examination may be performed in the sunlight under the shadow of one's hand.<span class="x" onmousemove="('comment',' Held between the sun and the object. ');"><sup>45</sup></span>
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