Reference for Bava Batra 119:8

אבל פותח הוא לרה"ר פתח כנגד פתח: דאמר ליה סוף סוף הא בעית אצטנועי מבני רה"ר:

IF IT IS SMALL HE SHOULD NOT ENLARGE IT. Rami b. Hama understood from this that if the door is of four cubits the owner should not make it eight because this would entitle him to eight cubits in the courtyard,<span class="x" onmousemove="('comment',' V. supra 55a. ');">⁵</span>

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