Reference for Chullin 282:49

יוני שובך ויוני עלייה חייבות בשלוח ואסורות משום גזל מפני דרכי שלום

- you may even say that it [the egg] fell into his courtyard, [nevertheless the law of letting the dam go applies], for whenever he himself may acquire it his courtyard acquires it for him, but whenever he himself may not acquire it his courtyard cannot acquire it for him either.<span class="x" onmousemove="('comment',' And since he cannot acquire it himself for the dam is sitting on it, his courtyard likewise cannot acquire it for him, so that it is not at his disposal, and therefore the law of letting the dam go applies.');">³²</span>

Rashi on Deuteronomy

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