Commentary for Eruvin 199:10

לא לעולם דלא הדרי כיפי והא קמ"ל אע"ג דצידו אחד שוה לארץ:

Our Rabbis taught: If the roots of a tree were three handbreadths high above the ground, or if there was a hollow space of three handbreadths beneath them, one must not sit on them even though on one side of the tree they were level with the ground, because it is not permissible<span class="x" onmousemove="('comment',' On the Sabbath.');">³¹</span> either to climb upon a tree or to suspend oneself from a tree or to recline on a tree; nor may one climb upon a tree while it is yet day<span class="x" onmousemove="('comment',' Of the Sabbath eve.');">³²</span> to remain there all the Sabbath day, the law being the same in the case of a tree and in that of any cattle. In the case of a cistern, a ditch, a cave or a wall one may climb up or climb down even if they were a hundred cubits [deep or high].<span class="x" onmousemove="('comment',' The prohibition to climb up or down a tree on the Sabbath is not title to the trouble or effort involved in the process but to a preventive measure against the possibility of intentional plucking of a growing plant, which is one of the acts of work forbidden on the Sabbath.');">³³</span>

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