Reference for Bekhorot 35:27

ההוא דבריא נפק ברישא:

Now, if we were to assume that the word meshammenin etc. means that they are divided equally, here also let them divide the live animal equally! Rather what is meant by meshammenin is that the fat animal [remains to be divided] between them,<span class="x" onmousemove="('comment',' And the priest takes the lean one, failing the evidence that the fat one was a first-born.');">⁹</span>

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