Commentary for Eruvin 202:12

ושמעת מינה מדרבנן איתא לדרב דימי דכי אתא רב דימי א"ר יוחנן מקום שאין בו ארבעה על ארבעה מותר לבני רשות הרבים ולבני רשות היחיד לכתף עליו ובלבד שלא יחליפו:

Said R'Bibi B'Abaye: From this Baraitha you may deduce three things: You may deduce that virtual cutting for the purpose of completing a prescribed width may be assumed; you may deduce that R'Meir<span class="x" onmousemove="('comment',' Who permitted a man standing on a threshold which was a karmelith to take a key from a level above ten handbreadths to a lock of a similar level; and did not provide against the possibility of the man's taking the key into the karmelith in which he stood.');">²⁹</span> withdrew from his view on the gates of a garden;<span class="x" onmousemove="('comment',' Supra 101a where, according to Raba's explanation, R. Meir forbade a man who stood in a karmelith to open a door in a private domain as a preventive measure against the possibility of his taking the key into the karmelith.');">³⁰</span> and from the ruling of the Rabbis<span class="x" onmousemove="('comment',' According to which, if the window-sill had an area of four handbreadths by four, it is forbidden to take a key from the threshold (a karmelith) to the lock (a free domain) and from the lock to the window (a private domain) because the transfer from one domain to another is forbidden even via a free domain.');">³¹</span>

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