Reference for Eruvin 9:9
אמר אביי מנא אמינא לה דתניא אין מבוי ניתר בלחי וקורה עד שיהו בתים וחצרות פתוחין לתוכו
[Might it then be suggested that] R'Joseph<span class="x" onmousemove="('comment',' Who ruled supra, in the case of an excavation at the foot of an entrance, that a width of four handbreadths is sufficient.');"><sup>33</sup></span> adopts the principle of R'Ammi<span class="x" onmousemove="('comment',' Who regards a strip of four handbreadths in width to be sufficient to constitute a wall as a support for a cross-beam. MS.M. adds: 'and R. Assi'.');"><sup>34</sup></span> and that Abaye<span class="x" onmousemove="('comment',' Who required for the excavation a width of four cubits.');"><sup>35</sup></span> does not hold the principle of R'Ammi?<span class="x" onmousemove="('comment',' MS.M. adds: 'and of R. Assi'. This is also the reading of Rashi.');"><sup>36</sup></span> Abaye can answer you: There<span class="x" onmousemove="('comment',' The case dealt with by R. Ammi and R. Assi.');"><sup>37</sup></span>
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