Reference for Menachot 100:12

תני תנא קמיה דר"נ מחצה ראשון ומחצה שני תעובר צורתן ויצאו לבית השריפה

should be treated so, since it was once valid for offering;<span class="x" onmousemove="('comment',' It therefore may not be burnt until it becomes invalid by being left overnight when 'its appearance becomes spoiled'.');">¹⁰</span> but as for the second, why must its appearance first be spoiled?

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