Reference for Chullin 280:32

ואמר רבי אלעזר

IF THERE WAS BUT ONE YOUNG BIRD OR ONE EGG [IN THE NEST], ONE IS STILL BOUND TO LET THE DAM GO, FOR IT IS WRITTEN: A NEST,<span class="x" onmousemove="('comment',' Deut. XXII, 6.');">¹⁵</span>

Rashi on Deuteronomy

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