Reference for Chullin 149:3

עבר בנהר הוכשר הלך לבית הקברות נטמא

Who is the Tanna that taught: 'If it waded through a river it has thereby become susceptible to uncleanness and if it next passed through a cemetery it has thereby become unclean'?<span class="x" onmousemove="('comment',' In other words, that a living animal can contract uncleanness.');">²</span>

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