Reference for Chullin 18:18

אמר רב אשי ת"ש

And R'Joshua B'Levi said: What is the reason for this?<span class="x" onmousemove="('comment',' That in the second case (where the bowl was found uncovered) the water is merely invalid, whereas in the first case (where the bowl was found covered) it is also regarded as unclean.');">¹⁴</span>

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