Reference for Chullin 34:24

שנאמר

In Nehardea it is usually examined with water.<span class="x" onmousemove="('comment',' Either by passing the sharp edge of the knife across a smooth surface of water, the presence of a notch being detected by the ripple caused; or by allowing a drop of water to trickle down the edge of the knife, when any notch would impede the course of this drop of water.');">¹⁵</span>

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