Reference for Chullin 128:18

אלא איזו זו ביצה טמאה

It can only mean the egg of an unclean bird.<span class="x" onmousemove="('comment',' I.e., the verse teaches first that the ostrich (ya'anah) is an unclean bird, and secondly, that the egg (bath, 'daughter') of an unclean bird is forbidden.');">¹³</span>

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