Reference for Chullin 136:33

בשר בשדה טרפה לא תאכלו מה תלמוד לומר

Rabbah said: It is like trefah; just as a trefah animal, once it has been rendered trefah, can never be permitted, so a flesh which had got out of its bounds can never be permitted again!<span class="x" onmousemove="('comment',' Even though it had been brought back within bounds.');">¹⁶</span>

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