Commentary for Bava Batra 44:1

הבא לסמוך לא יסמוך אלא אם כן הרחיק ממנו ארבע אמות מתקיף לה רבא והא מי שהיה כותלו סמוך לכותל חבירו קתני

If a man wants to build a wall alongside of his neighbour's wall, he must not do so unless he keeps it [at least] four cubits away. Raba strongly objected to this, on the ground that it says. IF A MAN [ALREADY] HAS A WALL RUNNING ALONGSIDE OF HIS NEIGHBOUR'S WALL. No, said Raba: what it means is this: If a man had a wall running alongside of his neighbour's wall at a distance of four cubits and it falls down, he must not bring another wall alongside unless he keeps it four cubits away,<span class="x" onmousemove="('comment',' Tosaf. points out that this would imply that according to Raba the second wall must be four cubits away only if the first was also, which is incorrect. ');">¹</span>

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