Midrash for Chullin 278:26
אלא לפניך לאתויי שהיו לפניך ומרדו
Then, in like manner, if a man found a nest in the sky,<span class="x" onmousemove="('comment',' The bird was carrying its nest while flying.');"><sup>12</sup></span>
Sifrei Devarim
(Devarim 22:6) "If there chance before you a bird's nest": to exclude what is normally found there.
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