Reference for Chullin 123:17

אלא

Rab Judah said: A bird which scratches is permitted for use in the purification rite of a leper;<span class="x" onmousemove="('comment',' Cf. Lev. XIV. On the day of his cleansing the leper was required to take two living clean birds for Purification. The type of bird that scratches is not precluded, i.e., it is regarded as clean. The epithet 'scratch' is applied to a bird perhaps by reason of it peculiar beak, possibly the fissirostral birds, i.e., that have the beak broad and deeply cleft.');">¹⁰</span>

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