Reference for Niddah 52:22

אמר ליה

R. Isaac b. Samuel b. Martha once sat at his studies before R. Kahana and in the course of the session he observed: Rab Judah citing Rab laid down that throughout the first three days<span class="x" onmousemove="('comment',' After the birth of a child. ');">²⁰</span>

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