Commentary for Bekhorot 109:33

לימא כתנאי

for this reason [the Mishnah] specially mentions the Jordan, but on the view of R'Ammi, why does it not mention all the rivers?<span class="x" onmousemove="('comment',' As forming a division and not allowing combination for the purpose of tithing, since according to his view the only reason why the Jordan forms a division is because there is no contact between the animals on the one side and the shepherd on the other. All rivers, consequently and not only the Jordan divide if they have no bridges.');">²³</span>

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