Reference for Chullin 64:17

וליחשוב נמי דרבי אלעזר דאמר רבי אלעזר

- It includes such nebelah only as does not convey uncleanness whilst alive, but not such nebelah as conveys uncleanness whilst alive.<span class="x" onmousemove="('comment',' In the cases of Hezekiah and R. Eleazar the animal is at once regarded as nebelah for all purposes even though the animal still shows signs of life by the convulsive movements of its limbs.');">⁶</span>

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