Reference for Eruvin 120:2
<big><strong>גמ׳</strong></big> קא סלקא דעתך למזרח למזרח ביתו למערב למערב ביתו
means the east side of his house and that WEST<span class="x" onmousemove="('comment',' So MS.M. (agreeing with the reading in our Mishnah) . Cur. edd. here add lamed, 'to the'.');"><sup>3</sup></span> means the west of his house,<span class="x" onmousemove="('comment',' The house being situated between him on the one side of it and his son on the opposite side.');"><sup>4</sup></span> one can well understand how it is possible that THE DISTANCE BETWEEN HIM AND HIS HOUSE WAS NO MORE THAN TWO THOUSAND CUBITS AND THAT BETWEEN HIM AND HIS ERUB WAS MORE THAN THIS, since he would reach his house before he could<span class="x" onmousemove="('comment',' Lit.,'and not'.');"><sup>5</sup></span>