Reference for Eruvin 199:9
תנן שרשיו גבוהין מן הארץ ג' טפחים לא ישב עליהם היכי דמי אי דלא הדרי כיפי פשיטא אלא לאו אע"ג דהדרי כיפי
This must consequently be a case, must it not, where they subsequently bent downwards?<span class="x" onmousemove="('comment',' And yet it is forbidden to sit on them. All objection against Rabbah.');"><sup>27</sup></span> - No, the fact is that they did not subsequently bend downwards, but<span class="x" onmousemove="('comment',' As to your objection. ' Is not this obvious?'');"><sup>28</sup></span> it is this tha we were informed: Even though [on] one of its<span class="x" onmousemove="('comment',' The tree's.');"><sup>29</sup></span> sides [they were] level with the ground.<span class="x" onmousemove="('comment',' Rabbah maintains his view only where more than one side was on a level with, or within three handbreadths front the ground.');"><sup>30</sup></span>