Reference for Sanhedrin 75:16

על גפי מרומי קרת רבה בר בר חנה רמי כתיב על גפי וכתיב על כסא בתחלה על גפי ולבסוף על כסא

Another answer is: For the sake of [the different] families, that they might not quarrel with each other.<span class="x" onmousemove="('comment',' On the superiority of their respective ancestry. ');">²⁷</span> Now, if at present, though but one was [originally] created,<span class="x" onmousemove="('comment',' I.e., when they all descend from one father. ');">²⁸</span>

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