Reference for Zevachim 186:4

איבעיא להו בדם מהו הלכתא היא ומהלכתא לא גמרינן

Now it was asked: How is it with blood? Is it a traditional law,<span class="x" onmousemove="('comment',' In the case of the water of lustration. - A traditional law is one handed down by tradition, and not Learnt directly or by inference from Scripture.');">⁵</span>

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