Commentary for Eruvin 193:4

אביי אמר רבי יהודה לטעמיה דאמר עניבה קשירה מעלייתא היא

Now, however, that the father of Samuel son of R'Isaac learned: 'Old ones are all those that have straps which are tied into a knot,<span class="x" onmousemove="('comment',' The knot in [he shape of a letter of the alphabet (yod or daleth) prescribed for the tefillin');">⁷</span> while new ones are such as have straps that are not tied into a knot,'<span class="x" onmousemove="('comment',' The knot in [he shape of a letter of the alphabet (yod or daleth) prescribed for the tefillin');">⁷</span> all might be assumed to agree<span class="x" onmousemove="('comment',' Since the reason why new ones may not be carried on the head and arm to a place of safety on the Sabbath is not because they might be mere amulets but because not having the prescribed knot they cannot be worn, since no permanent knot may be made on the Sabbath.');">⁸</span>

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