Yerushalmi Eruvin 7:5 ירושלמי עירובין ז׳:ה׳

MISHNAH: If a straw-heap between two courtyards is ten [hand-breadths] high, one makes two eruvin but cannot make one eruv. Each feeds from his side. If the straw became less than ten [hand-breadths] high, one makes one eruv but cannot make two eruvin⁸It is assumed that the straw heap fills the entire space between the two courtyards from wall to wall. Then the straw acts as a temporary wall. If at the start of the Sabbath one cannot move from one side to the other one must make two eruvin. But if the temporary wall is no more than 10 hand-breadths high it must be disregarded and one eruv is obligatory..

HALAKHAH: Paragraph. Rebbi Eleazar said, so is the Mishnah⁶⁶Mishnah 5. One should not read the Mishnah as requiring that the cattle be brought to feed from the straw; the straw may be taken in containers and carried to the animal barn. Rejected by the Babli 79a.: “Each fills his pail and feeds from his side.” Rebbi Ḥaggai said, when we were sitting before Menaḥem we used to say, lest you say that he is not like one taking down tents but one who supports tents, for if the straw was flattened he supports it by his pail⁶⁷Since the heap of straw acts as a wall between the courtyards, forcing two eruvin, should taking straw from it not be classified as tearing down a wall, prohibited on the Sabbath? Even taking straw to smoothe the surface of the heap might be construed as prohibited activity. Therefore the statement of R. Eleazar is required; changing the shape of a straw heap is not a building activity since, as noted in the sequel, these are only temporary changes whereas building leaves long term results.. Rav Hoshaia asked: What if he used a sheet and supported it by a chair? It is meant here temporarily, but it is meant there for permanence.

It was stated:⁶⁸Tosephta 6:17. “A straw heap between two courtyards. Each one opens his door and feeds. If the straw was less than ten hand-breadths, both are forbidden until they make an eruv. Therefore if one of them wants to block his door and cede his rights, he is forbidden but his neighbor is permitted.” (And so it is with a cistern) [A ditch]⁶⁹The text in parentheses was originally written by the scribe; he himself then deleted it and replaced it by the text in brackets which makes the sentence a meaningless quote from Mishnah 3. The original statement seems to be that from a cistern between two houses, where in general one may not draw water on the Sabbath (Mishnah 8:7), if one of the owners locks his door and cedes his rights, the other party may use the cistern without problems. between two courtyards. This implies that one may not cede from courtyard to courtyard⁷⁰Since cession alone is not enough without locking the door.. This implies, even if they did not make an eruv. ⁷¹Chapter 6, Notes 161,162. This implies, even if they did not intend to. This implies that two domains may not use one domain. This implies, if each of them uses his door, both are forbidden. And so it is with a house between two courtyards, not following Rebbi Meïr, who said that a locked house is forbidden⁷²Mishnah 8:5..