If one (person) from the outer forgot and did not make an eruv, the inner is permitted and the outer forbidden. (If one person) from the inner (forgot) and did not make an eruv, both are forbidden, [for the inner is "a foot forbidden," and it forbids (the outer)]. If they placed their eruv in one place, and one of them forgot, whether an inner (person) or an outer, and he did not make an eruv, both are forbidden. [If they made an eruv with each other and placed the eruv in the outer (It is called "one place" because both courtyards use it in common), and even if an outer person forgot and did not make an eruv both are forbidden. The inner is also forbidden to carry in its courtyard, for it cannot disassociate itself from the outer and use (the inner courtyard) by itself, for its eruv is not present. For that eruv which permits the (inner) courtyard was taken to the outer. But if the eruv were placed in the inner, the outer is forbidden through the forgetting of the inner, but the inner is not forbidden through the forgetting of the outer, for "it (the inner) locks the door" and uses it.] But if they (the courtyards) belonged to individuals, [i.e., if there we only one in the inner and one in the outer], they need not make an eruv [with each other because of drisath haregel], for since there is only one person in the inner, this is "a foot that is permitted," and it does not forbid (the outer). This anonymous Mishnah is in accordance with the first tanna (above), who holds that "a foot that is permitted" does not forbid.]
Bartenura on Mishnah Eruvin
שכח אחד מן הפנימית כו' – it was the inside [courtyard] the foot is prohibited [from carrying] and restricts.
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English Explanation of Mishnah Eruvin
Introduction
This mishnah continues to deal with two courtyards, an inner one and an outer one.
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Bartenura on Mishnah Eruvin
נתנו ערובן במקום אחד – both of them made Eruvin one with the other and placed the Eruv in the outer [courtyard] and called it one place because both of the courtyards use it as one and even one from the outer courtyard forgot and did not make an Eruv, both of them are forbidden [to carry in] for even the inner [courtyard] is also forbidden to carry in its courtyard for it cannot be removed from the outer [courtyard] to use it for itself for it lacks an Eruv over it for that same Eruv that permits [carrying] in the courtyard, they carried it to the outer [courtyard] but placed the Eruv in the inner [courtyard], the outer courtyard prohibits through the forgetfulness of the [people of the] inner [courtyard, but the inner [courtyard] but the inner [courtyard] does not prohibit through the forgetfulness of the [people of the] outer [courtyard] for they use one entrance.
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English Explanation of Mishnah Eruvin
If one of the [residents] of the outer courtyard forgot to participate in the eruv, the inner courtyard is permitted but the outer one is forbidden. If one of the residents of the outer courtyard forgot to participate in their eruv, the eruv of that courtyard is ineffective, as we have learned several times in this chapter. However, the inner courtyard’s eruv is still valid, since it doesn’t depend on that of the outer one.
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Bartenura on Mishnah Eruvin
ואם היו של יחידים – for the [people of] the inner [courtyard are not other than one, and the outer [courtyard] is only one, there is no need to make an Eruv each with the other because of foot traffic, for since it is of an individual in the inner [courtyard], it would be the foot that permits and does not restrict, and the anonymous Mishnah is according to the first Tanna/teacher of above that holds that the foot which permits does not restrict.
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English Explanation of Mishnah Eruvin
If one of the [residents] of the inner courtyard forgot to contribute to the eruv, both courtyards are forbidden. In this case, since the inner courtyard’s eruv is invalid, the outer courtyard’s eruv is ineffective as well (as we learned in section two of yesterday’s mishnah).
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English Explanation of Mishnah Eruvin
If they gave their eruv in the same place and one [resident], whether of the inner courtyard or of the outer courtyard, forgot to contribute to the eruv, both courtyards are forbidden. If both courtyards put their eruv together, they become like one domain with one eruv. Therefore, if even one resident from either courtyard forgot to participate in the eruv, it becomes forbidden to carry in either courtyard. This is like the normal situation where one person forgot to participate in the eruv, thereby causing it to be forbidden to carry in the entire courtyard.
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English Explanation of Mishnah Eruvin
If the courtyards belonged to individuals, they need not prepare any eruv. If each courtyard belongs to an individual, then neither must set up an eruv in order to carry within his own courtyard. This opinion matches that which was taught in section three of yesterday’s mishnah, that if each courtyard sets up its own eruv, the residents of each may carry in their own courtyard.