Reference for Chullin 253:5

אביא עכבר שחציו בשר וחציו אדמה

can render unclean, but those that do not breed cannot render unclean, and so I would exclude the mouse which is half flesh and half earth since it does not breed.<span class="x" onmousemove="('comment',' Consequently the expression 'upon the earth' would signify that all creatures, whether land or sea creatures, if they have fallen into the sea, cannot render anything unclean.');">⁴</span>

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