Reference for Eruvin 199:7

אמר רב אחא בר תחליפא דשרא לך כרבה שרא לך

Is not this obvious? - It might have been presumed that even according to the view of R'Shesheth a house<span class="x" onmousemove="('comment',' As in the case of a window (supra 76b) .');">²²</span> is regarded as full<span class="x" onmousemove="('comment',' Sc. as if it were full of earth up to the ceiling.');">²³</span> and that one may, therefore, use a tree within less than three handbreadths from the roof, hence we were informed [that the decision was given only in accordance with the view of Rabbah]. We learned: IF ITS ROOTS ARE THREE HANDBREADTHS HIGH ABOVE THE GROUND ONE MAY NOT SIT ON THEM.

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