Reference for Chullin 244:5

בן שנתו והוא שיונק

Resh Lakish enquired of R'Johanan: 'Can the skin of the head of a young calf convey uncleanness or not? ' - He replied: 'It cannot' - 'But', said the other, 'you, our teacher have taught us, "IN THE FOLLOWING CASES THE SKIN IS CONSIDERED AS FLESH:.

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