Reference for Niddah 52:40

א"ל הכי אמר רב

R. Jose b. Saul enquired of Rabbi: What is the law where there was an abortion in the shape of a raven and [this was followed by] a placenta?<span class="x" onmousemove="('comment',' Is the placenta, it is asked, attributed to the raven-shaped embryo or is it attributed to a human embryo that may have been crushed in it? ');">³⁷</span>

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