Reference for Bava Batra 39:9

ועוף ששכן בחלון פרח ואזיל בקשור שחיט ליה בטמא מזבין ליה לנכרי בקלניתא

'Or which has grown there' of itself — will it not be removed as injurious to the wall?<span class="x" onmousemove="('comment',' And since it is liable to be removed at any moment, we should count it as non-existent. ');">⁹</span>

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