Una abertura (en una pared) entre dos patios, cuatro por cuatro (ancho de mano) en medio de diez (tefachim) desde el suelo [es decir, si parte de él, incluso una parte muy pequeña, está a diez tefachim desde el suelo] —se hacen dos eruvin, [cada uno (patio) para sí mismo, y cada uno prohíbe (llevar de uno a) el otro.] Y si lo desean, hacen un eruv, [estos (los hombres de un patio) colocan su eruv en el otro y ser uno con ellos (los hombres del otro patio)]. Menos de cuatro por cuatro o más de diez, se hacen dos eruvin y no se hace uno. [Menos de cuatro por cuatro no es (considerado) una abertura y no es apto para pasar de uno a otro. Y si también está por encima de diez, no se presta para su uso. Por lo tanto, no se hace un eruv. Esto, solo en un patio sin techo; pero en una casa techada, incluso por encima de diez, se hace un eruv, siendo habitual colocar bancos y cajas alrededor de la casa, de modo que se preste para su uso.]
Bartenura on Mishnah Eruvin
חלון. בתוך י' – that it is a part of it and even a minimum amount within ten [handbreadths] nearest the ground.
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English Explanation of Mishnah Eruvin
Introduction
The first five mishnayot of this chapter deal with two courtyards that are adjacent to one another and whether or not they may make a joint eruv.
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Bartenura on Mishnah Eruvin
מערבין שנים – two Eruvin, these to themselves and those to themselves and they are prohibited one with the other. .
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English Explanation of Mishnah Eruvin
If a window between two courtyards was four handbreadths by four handbreadths, and was within ten handbreadths [from the ground], the tenants prepare two eruvin or, if they want, they may prepare one. If there is a window which is four by four handbreadths and is less than ten handbreadths from the ground, then this window has the potential but not the necessity to join the two courtyards into one common domain. If the residents of the two courtyards make one joint eruv, then they may both carry in both courtyards, because both courtyards are in essence one. If they set up separate eruvin, the residents may carry only in their own courtyards.
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Bartenura on Mishnah Eruvin
ואם רצו מערבין א' – one Eruv that they will their Eruv in the other one and make their Eruv with them and it will be one/united [for both].
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English Explanation of Mishnah Eruvin
If [the size of the window was] less than four handbreadths by four handbreadths or higher than ten handbreadths from the ground, they may prepare two eruvin but not one. However, if the window was smaller than four by four handbreadths, or higher, then it doesn’t join the two courtyards and each can only set up their own eruv. The reason why the window does not join the two courtyards if it is set higher is that in such a case there is a full ten handbreadth wall separating the two. Such a wall is sufficient to count as a full separation. Furthermore, with a window this high it will be difficult to see from one courtyard into the other, helping separate their identities.
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Bartenura on Mishnah Eruvin
פחות מד' – it is not an opening/door and it is not appropriate to pass from this one to that one, and above ten [handbreadths] it is not satisfactory; therefore, we don’t make one Eruv, and specifically in a courtyard that is not its source, but in the original house, even if it is above ten [handbreadths] we make one Eruv in the manner to place benches and chests around the house and it is usage is satisfactory.