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Omed merubah al haparetz

A lechi or a korah is invalid for a mavoi that has an opening of more than ten amos. However, if part of the opening is closed up, and the opening is presently ten amos or less, a lechi or a korah would then be sufficient. One of the methods used to close up an opening is known as omed merubah al haporetz. This means that if the partition has open areas, they are considered closed off as long as a majority of the wall is still standing. To illustrate this concept: A particular mavoi has an opening of twenty amos . If one were to build a wall three amos wide within two amos of the edge of the opening, he has now created a halachic wall five amos wide. Since the actual wall (three amos) is larger than the opening next to it (two amos) it is as if the opening is also closed off. If the same thing would be done on the other end, ten amos out of the twenty amoh break is closed off, then the remainder of the opening may now be fixed with a lechi or a korah since it is only open ten amos.

[ שו"ע שסג, לד, משנ"ב קמה-קמו, ושעה"צ קלה]

A mavoi with a large and small opening

In the above-mentioned case of a mavoi with a large opening and two additional smaller openings, the following halacha applies. If a lechi or a korah is built next to the large opening, then the residents of the mavoi must be careful not to use the smaller opening to enter or exit the mavoi. If they do so, they nullify the larger opening from serving as the doorway into the mavoi, and its’ lechi or korah is now ineffective. The poskim disagree if the residents may use the smaller opening if they close it off with a tzuras hapesach.

[ שו"ע שסג, לד, ומשנ"ב קמח-קנ; ביאורים ומוספים דרשו, 144-143 ,וראה עוד שם]

A mavoi that does not need to be closed off
In some instances, a mavoi that is situated higher than the ground of the reshus harabim, may not need to be closed off by a lechi or a korah. If the floor of the entrance slopes, towards the opening of the mavoi, to a height of ten tefachim over a distance of four amos, the incline itself will serve as a partition to enclose the mavoi.

[ שו"ע שסג, לו, ומשנ"ב קנב-קנה; ביאורים ומוספים דרשו, 146-145]
  • After a mavoi-alleyway is closed off (either by a lechi or a korah), a shituf mavoios must be made.

  • If a lechi or a korah is placed in the middle of the mavoi one may only carry up until where they are situated.

  • A mavoi may be split in half with a pas daled, two lechis or a tzuras hapesach. The two sections would each make their own shtiufei mavoios.

  • A mavoi open on both sides

  • Eiruv chatzeiros and shituf mavoios

  • Separating a courtyard form the rest of the mavoi
PLEASE NOTE: The information in this email is for learning purposes only. Please review the Mishna Berura and Biurim U'Musafim before making a halachic decision. Hebrew words are occasionally transliterated to enable a smoother reading of the text. Common Ashkenazi pronunciation is generally used in these cases.
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