Reference for Niddah 60:29

ודילמא אי קרעוהו להך דנקבה בארבעין וחד הוה משתכחא כזכר

But why [should the test spoken of by the Rabbis be described as] 'proof from some fools'? — It might be suggested that the conception of the female preceded that of the male by forty days.<span class="x" onmousemove="('comment',' And that this was the reason why in the Cleopatra test both were found to be fully fashioned. ');">²⁸</span>

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