Commentary for Niddah 61:64
כדרבי אבהו דרבי אבהו רמי
Our Rabbis taught: At first it used to be said that 'if the woman emits her semen first she will bear a male, and if the man emits his semen first she will bear a female', but the Sages did not explain the reason, until R. Zadok came and explained it: These are the sons of Leah, whom she bore unto Jacob in Paddan-aram, with his daughter Dinah,<span class="x" onmousemove="('comment',' Gen. XLVI, 15. ');"><sup>57</sup></span>
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