Reference for Bava Batra 34:10

אמר לך רבא הא איתמר עלה אמר אביי ואיתימא רב יהודה מכותל בורו שנינו

it presents a difficulty [does it not], according to that of Raba? — Raba could reply to you: It has already been reported in this connection that Abaye [or it may be Rab Judah] said that the word WALL in the Mishnah means 'the wall of his pit'.<span class="x" onmousemove="('comment',' Which implies that, even if there is no pit on the other side, the pit itself must be kept three handbreadths from the boundary to allow space for the wall (i.e. side). ');">⁷</span>

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