Zikui, Shared Ownership, and the Communal Food

A community does not need every household to hand over its own piece of bread in order to establish the communal eruv. One person may set aside qualifying food and give all the residents a halachic share in it. The act that accomplishes this is zikui.

Zikui is what turns one person's loaf or matzah into communal food. It is an actual acquisition of a share in the food on behalf of the people included in the eruv. It does not give them ownership of one another's homes, the streets, utility poles, or the land enclosed by the eruv.

What the ownership means

The Alter Rebbe makes this distinction explicit when explaining eruv chatzeiros. The bread does not have to be worth a perutah so that the other residents can purchase a portion of the house in which it is kept. They do not need to acquire a legal share in that house. The eruv works because, through the shared food, they are regarded as dwelling together there for the purposes of this halacha. (Shulchan Aruch Harav, Orach Chaim 366:4.)

The ownership that must be real is the residents' share in the food itself. When that food is held in common, it joins them as one body for eruv purposes.

The same point can arise without a special eruv loaf. The Alter Rebbe rules that if the residents already jointly own bread as part of a partnership and the bread is kept in a dwelling, that joint bread can itself supply the necessary communal relationship. It does not have to have been deposited there originally for the sake of an eruv. (Orach Chaim 366:16.)

How zikui is performed

When one resident provides the bread for everyone, he cannot simply declare that the bread belongs to all while continuing to hold it entirely as his own. The Alter Rebbe requires him to grant the other residents their shares through another person.

The procedure is straightforward in principle. The owner gives the food to a qualifying third party. That person lifts it by a tefach with the intention of acquiring shares in it on behalf of all the residents included in the eruv. The basis is the rule of zachin l'adam shelo b'fanav, a benefit may be acquired for a person even when he is not present and did not appoint the acquirer as his agent. (Orach Chaim 366:12.)

The person making the zikui should include the residents who are there and those who will become part of the area during the period for which the eruv is intended. The Alter Rebbe specifically warns that otherwise new residents can create a problem when the population changes. The detailed rules of whose participation may be acquired without prior consent depend on how the person's home is situated and whether joining this particular eruv is necessarily a benefit to him. Those case-specific laws remain part of the zikui process even when one communal loaf is used for a large area.

There are also detailed rules concerning who may serve as the intermediary for the kinyan. They turn in part on whether the intermediary has an independent halachic capacity to acquire from the person providing the food. In communal practice, the Alter Rebbe records the custom that the shul attendant gives the loaf to the Rav, who takes possession of it on behalf of the entire congregation. (Orach Chaim 366:10.)

The partnership has to be real

The communal food cannot remain private in substance while being called communal in name. The Alter Rebbe rules that a participant may not object to another participant eating his share. He explains the word eruv as a joining in which the participants are satisfied with their common partnership, שותפות נוחה וערבה. If the owner reserves the bread in a way that would prevent another participant from taking his portion, the required joining has not been created. (Orach Chaim 366:8.)

This is why zikui is more than announcing the names of the residents. The food must actually pass into the shared halachic ownership created on their behalf.

How much food is required

For an eruv with eighteen or fewer participating householders, the Alter Rebbe gives a fig-sized portion of bread for each participant. Once there are more than eighteen, the amount no longer rises with the number of households. The required total is food for two meals, which he identifies as eighteen fig-sized portions, equal to six average egg-volumes of bread, while recording another opinion that requires eight egg-volumes. (Orach Chaim 368:3.)

That fixed shiur is significant in a citywide arrangement. Hundreds or thousands of residents do not require hundreds or thousands of individual pieces of matzah. A single qualifying quantity can be acquired on behalf of the entire included community.

Why a communal matzah can last for more than one Shabbos

The Alter Rebbe records the custom to make the eruv with matzah before Pesach and use it through the year because matzah keeps longer than ordinary bread. The food must nevertheless remain edible. If it becomes moldy and unfit for eating, it is treated as destroyed. He therefore notes that the annual custom does not remove the practical concern that the matzah may eventually spoil. (Orach Chaim 368:4.)

The continuing validity of the communal food thus depends on more than the original zikui. The food that carries the partnership must continue to exist in a halachically usable condition, subject to the laws governing how much must remain after the eruv was originally established.

Where the food is kept

An eruv chatzeiros, whose function is tied to residence, is kept in a place fit for dwelling. A shitufei mevo'os has broader rules regarding both the food and the place where it is deposited. When the shituf is made with bread, it can also serve for the eruv chatzeiros under the conditions stated by the Alter Rebbe. This is the basis of the established practice of keeping the communal bread or matzah in the shul. (Orach Chaim 386:1; 387:1.)

The food, its ownership, and its location all belong to the communal component of the eruv. They do not establish the surrounding mechitzos and do not answer whether a street is a reshus harabim. Where non-Jewish rights create an additional rabbinic restriction, sechiras reshus is required as a separate act.