Reference for Chullin 247:27

שיריו ברובו רובו דטפח למאי הוי

Now only if there is a fragment of four handbreadths [is it still unclean], but if there is no fragment of four handbreadths it is clean!<span class="x" onmousemove="('comment',' This clearly contradicts the aforementioned Mishnah which states that an oven to be made clean again must be divided into three parts, but it would not be sufficient to divide it into two, even though each part would be less than four handbreadths.');">¹²</span>

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