Reference for Bava Batra 9:5
<big><strong>מתני׳</strong></big> כותל חצר שנפל מחייבין אותו לבנותו עד ארבע אמות בחזקת שנתן עד שיביא ראיה שלא נתן
Said R. Safra the son of R. Yeba to Rabina: You know the saying, The hide costs four zuzim, and four are for the tanner.<span class="x" onmousemove="('comment',' Apparently R. Safra meant that by having two fields instead of one, Ronya, who was a poor man, would save expense, and therefore Rabina ought to let him keep it. But the exact application of the saying here is obscure. v. Rashi and Tosaf. ');"><sup>9</sup></span> <b><i>MISHNAH</i></b>. IF THE PARTY WALL OF A COURTYARD FALLS IN, EACH OF THE NEIGHBOURS CAN BE COMPELLED BY THE OTHER TO [CONTRIBUTE TO THE COST OF] REBUILDING IT TO A HEIGHT OF FOUR CUBITS.<span class="x" onmousemove="('comment',' This being the minimum to prevent overlooking. ');"><sup>10</sup></span>
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