Commentary for Menachot 69:11

תנא תפילין מרובעות הלכה למשה מסיני אמר רב פפא בתפרן ובאלכסונן

- It might sometimes become twisted.<span class="x" onmousemove="('comment',' And the inside would be seen.');">¹²</span> A Tanna taught: That the tefillin must be square is a law given to Moses at Sinai. R'Papa<span class="x" onmousemove="('comment',' According to MS.M., 'Rab'. In the parallel passage in Meg. 24b, 'Raba'. So Alfasi.');">¹³</span>

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