עירובין ט׳:ד׳ - י׳:א׳

על גבי שני בתים – and they are on two sides of the public thoroughfare, we carry underneath the upper room, for the mouth of the ceiling from each side descends and closes.

וכן גשרים המפולשים (bridges under which there is an open passage) – and they have partitions from below on the two sides.

מערבין למבוי המפולש (for an alleyway which is a thoroughfare) – for since there are two partitions, that he (i.e., Rabbi Yehuda) holds that an alleyway that has two partitions, according to the [laws of the] Torah is a private domain. But the Halakha is not according to Rabbi Yehuda.

המוצא תפילין – in a field in a place where they (i.e., the Tefillin) are not guarded.

זוג זוג – one for the head and another for the arm, in the manner that one dons them on weekdays, and that is as a pair, and then he always returns them and brings them in pair by pair until he brings in all of them, as he (i.e., the anonymous Tanna of our Mishnah) holds that Shabbat is a time for Tefillin, but the Sages made a decree upon them lest a strap breaks and he brings them with his hand, and if he were to don more than one pair, there is [the problem] of “not adding [to the commandment]” and this prohibition of “not adding” compares them upon him as a burden. But Rabban Gamaliel holds that Shabbat is not a time for Tefillin and that is the reason why the Rabbis permit saving them because it is adornment; hence, we bring them in two pairs at a time. For two pairs are an adornment since we taught that where there is on the head a place to wear two Tefillin, and all the while that they are an adornment, it is permitted, but because of [the prohibition of]“not adding” doesn’t apply here, for there is no commandment of Tefillin here at all, other than the rest of mere clothing. But the Halakha is not according to Rabban Gamaliel.

בישנות – where the knot is recognized (i.e., in old Tefillin) that they are definitely Tefillin and they have sanctity, and it is prohibited to place them in a contemptable location, but new Tefillin, we do not desecrate the Sabbath for them to bring them in for perhaps there are a mere amulet, and there is no sanctity other when they are made according to Jewish law for their purpose [of being Tefillin].

צבותים – each pair of Tefillin is tied to itself.

כרוכים – many pairs [of Tefillin are tied] together.

מחשיך עליהן – he sits and guards them until it becomes dark, and once it becomes dark, he brings all of them in together as in the case when they are many. For if he were to bring them pair by pair, he would not complete his bringing them in prior to the night, and if they are in a manner that he would complete bringing them in to the house before the night, he brings them in pair by pair as we stated.

ובסכנה – when they decreed religious persecution [against the Jewish religion] to not wear Tefillin, and our Mishnah is deficient and should be read as follows: when is this said, in the danger of religious persecution, but if he fears to delay there because of robbers, he carries them less than four cubits.