Reference for Chullin 116:31

אע"ג דלא הדרי וערבי מאי עד כאצבע

Now it is well according to him who says that they must be fused into one, for that would be the meaning of the phrase 'within a fingerbreadth';<span class="x" onmousemove="('comment',' I.e., within the space of a finger breadth they become fused into one.');">¹⁶</span>

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