Reference for Bekhorot 14:6

היוצא מן הטמא טמא והיוצא מן הטהור טהור

We have learnt this in the Mishnah: THAT WHICH GOES FORTH FROM THE UNCLEAN IS UNCLEAN, AND THAT WHICH GOES FORTH FROM THE CLEAN IS CLEAN, and this [urine] also comes from an unclean animal.<span class="x" onmousemove="('comment',' According to this version therefore, whether it is thick or otherwise, it is forbidden (R. Gershom) .');">³</span>

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