Reference for Chullin 246:22

לא שנו אלא שלא שייר בה כדי מעפורת אבל שייר בה כדי מעפורת חבור

uncleanness, and a man had the intention to use it for straps and sandals, so soon as he puts the knife into it it becomes clean;<span class="x" onmousemove="('comment',' By putting the knife to it he has annulled it from its original use even though there are as yet substantial pieces left each five handbreadths square, this being the minimum size for leather to contract midras uncleanness (cf. Kel. XXVII. 2) .');">¹⁵</span>

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