Commentary for Niddah 49:42

מדרבנן וקרא אסמכתא בעלמא הוא

but the fact is that R. Joshua was rather doubtful on the matter and, therefore, he followed a restrictive course in both cases.<span class="x" onmousemove="('comment',' In that of a firstling of cattle and in that of a woman's uncleanness (as will be explained presently). ');">³⁷</span>

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