Halakhah for Eruvin 46:7
ר"א אומר אם היתה ארכה כו': והתניא ר"א אומר אם היתה ארכה יתר על פי שנים ברחבה אפי' אמה אחת אין מטלטלין בתוכה
in front of it and one of twenty cubits on every side.<span class="x" onmousemove="('comment',' The Tabernacle was thirty cubits long and ten cubits wide. Dividing the length of the court (hundred cubits) in two sections and setting up the Tabernacle in one of these, its eastern front touching the dividing line, and its southern side removed twenty cubits from the south wall of the court there would remain (since the width of the court was fifty cubits) the following distance between the Tabernacle and the walls of the court. (100 - 50) X 50 = 50 X 50 cubits in front of it, 50 - 30 = 20 at its back, and (50 - 10) /2 = 20 cubits on its sides.');"><sup>12</sup></span> R'ELIEZER RULED: IF ITS LENGTH EXCEEDED etc. Was it not taught, however, that R'Eliezer ruled: If its length was more than twice its breadth, even if only by one cubit, it is forbidden to move objects within it? - R'Bebai B'Abaye replied: What we learned in our Mishnah we learned [in respect of an enclosure whose length] was more than twice its width.