Reference for Chullin 123:22

הא דרב נחמן מאי

But according to the other version which reports the dispute about the green-bellied kind, why is 'the white senunith' mentioned? - In order to exclude the black kind which nests in [eaves of] houses.<span class="x" onmousemove="('comment',' This type of swallow is certainly forbidden.');">¹²</span>

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