Mishneh Torah (Rambam) משנה תורה

Wherever ten Jews live, it is necessary to establish a place for them to congregate for prayer at the time of each prayer service. This place is called a Beit K'nesset. The inhabitants of a city can compel each other to construct a synagogue and to purchase scrolls containing the Torah, the Prophets, and the Sacred Writings.

When a synagogue is built, it should be built only at the highest point of the city [as implied by Proverbs 1:21]: "She cries at the head of the public places." It should be built [so that] its height exceeds [that of] all the other buildings in the city [as implied by Ezra 9:9]: "to lift up the house of our God." The entrance to the synagogue should open only on the east [as implied by Numbers 3:38]: "...And those who camped before the sanctuary on the east." In [the synagogue], a heichal, where the Torah scroll is placed, should be constructed. The heichal should be constructed in the direction to which the people pray in that city, so that they will face the heichal when they stand to pray.

A platform is placed in the center of the hall, so that the one who reads the Torah or one who gives a sermon can stand on it, so that all the others will hear him. When one positions the tevah which contains the Torah scroll, one should position it in the center of the hall, in the direction of the heichal and facing the people.

How do the people sit in the synagogue? The elders sit facing the people with their backs toward the heichal. All the people sit row after row, each row facing the back of the row before it. Thus, all the people face the sanctuary, the elders, and the tevah. When the leader of the congregation stands to pray, he stands on the ground, before the tevah, facing the sanctuary like the others.

Synagogues and houses of study should be treated with respect. They should be swept clean and mopped. All the Jews in Spain, the west, Babylonia, and Eretz Yisrael, are accustomed to light lamps in the synagogue and spread mats over the floor to sit on. In European communities, they sit on chairs.

No lightheadedness - i.e., jests, frivolity, and idle conversation - should be seen in a synagogue. We may not eat or drink inside [a synagogue], nor use [a synagogue] for our benefit, nor stroll inside one. On a sunny [day], one should not enter [a synagogue to seek shade] from the sun, and on a rainy [day], [one should not enter a synagogue to seek shelter] from the rain. [However,] the sages and their students are permitted to eat and drink in a synagogue because of the difficulty [observing the prohibition would cause them].

It is forbidden to calculate accounts in [a synagogue], unless the accounts are connected with a mitzvah: for example, the collection of charity, the redemption of captives, or the like. [Similarly,] eulogies should not be recited inside them, except a eulogy that involves many [of the inhabitants of the city]; for example, [if] there were a eulogy of the great sages of that city for which all the people would gather together and come.

If a synagogue or a house of study has two entrances, one should not use it for a shortcut, i.e., to enter through one entrance and leave through the other to reduce [the distance one] travels, because it is forbidden to enter [these buildings] except for a mitzvah.

A person who has to enter a synagogue to call a child or his friend should enter and read [a portion of the written law] or relate a teaching [of the oral law] and then call his friend, so that he will not have entered [a synagogue] for his personal reasons alone. If he does not know [how to study], he should ask one of the children [to] tell him the verse he is studying or, [at the very least,] wait a while in the synagogue and then leave, since spending time [in the synagogue] is one of the aspects of the mitzvah as implied by [Psalms 84:5]: "Happy are those who dwell in Your house."

A person who enters [a synagogue] to pray or to study is permitted to leave by the opposite door to shorten his way. A person is permitted to enter a synagogue [holding] his staff, [wearing] his shoes, wearing [only] lower garments, or with dust on his feet. If it is necessary for him to spit, he may spit in the synagogue.

Synagogues and houses of study that have been destroyed remain holy [as can be inferred from Leviticus 26:31]: "I will destroy your sanctuaries." [Our Sages explained]: Even though they are destroyed, they remain holy. Just as one must treat them with respect while they are standing, so must they be treated [with respect] when they are destroyed with the exception of sweeping and mopping them. [When destroyed], they need not be swept or mopped. If grass grows in them, it should be pulled out and left there so that it will be seen by the people [in the hope that] it will rouse their spirits and rebuild them.

One should not tear down a synagogue in order to build another in its place or in another place. Instead, one should build the [new synagogue] and then, one [may] tear down the [previous] one lest unforeseen difficulties arise [which prevent it] from being built. This applies even to a single wall of [a synagogue]. One should build the new wall next to the old wall and then, tear down the old wall.

When does the above apply? When its foundations are not ruined or its walls are not leaning perilously. However, if its foundation is destroyed or its walls are leaning perilously, it should be destroyed immediately and [then, efforts to] rebuild it should be begun immediately throughout the day and night lest times become difficult and it remain destroyed.

It is permitted to transform a synagogue into a house of study. However, it is forbidden to transform a house of study into a synagogue because the sanctity of a house of study exceeds that of a synagogue and one must proceed to a higher rung of holiness, but not descend to a lower rung. Similarly, the inhabitants of a city who sold a synagogue may purchase an ark with the proceeds. If they sold an ark, they may purchase a mantle or a case for a Torah scroll with the proceeds. If they sold a mantle or a case, they may buy chumashim with the proceeds. If they sold chumashim, they may buy a Torah scroll with the proceeds. If they sold a Torah scroll, the proceeds may only be used to purchase another Torah scroll, for there is no level of holiness above that of a Torah scroll. The same [laws apply] to [any money] which remains.

Similar [principles apply] if a congregation collected money to build a house of study or a synagogue or to purchase an ark, a mantle or a case [for a Torah scroll], or a Torah scroll, and desired to change [the purpose for which] all the [funds] had been [originally] collected. It is forbidden to change [the purpose for which the funds will be used] except from a matter of lesser sanctity to one of greater sanctity. However, if [the congregation] accomplished the purpose for which they had [originally] collected [the funds], they may use the remainder for whatever they desire. All the components of a synagogue are considered like the synagogue itself. The curtain hanging before the ark is considered like the mantle of a Torah scroll. If a condition was made concerning them, the terms of the condition are binding.

When do the above statements permitting the sale of a synagogue apply? In regard to a synagogue in a village. Since it was constructed for the sake of the inhabitants of that village alone, so that they can pray inside it, they are permitted to sell it if they all desire to do so. In contrast, a synagogue in a metropolis, since it was constructed for the sake of all the people in the world, [i.e.,] so that anyone who comes to that country can come and pray in it, it is considered as [the property] of [the entire] Jewish people and it can never be sold.

The inhabitants of a village who desire to sell their synagogue in order to build another synagogue with the money, or to buy an ark or Torah scroll with the money, must establish as a condition [of the sale] that the purchaser not use the building for a bathhouse, a leatherworks, a mikveh, or a laundry. If, at the time of the sale, the seven officials of the community made a condition in the presence of the entire community that the purchaser be allowed to use the building for the above purposes, he may.

Similarly, if the seven officials of the community made a condition in the presence of the entire community that [after the community accomplished the purpose for which they sold the synagogue], the remainder of the funds could be used for mundane purposes, they may be used for such purposes. Thus, after the money has been used for building another synagogue, for purchasing an ark, a mantle or case [for a Torah scroll], chumashim, or a Torah scroll, the remainder may be used for mundane purposes in accordance with their condition, and may be used for whatever they please.

Similarly, if all the inhabitants of a city - or a majority of them - accept [the authority of] a single individual, whatever actions he takes [in regard to a synagogue] are binding. He may sell [the synagogue] or give [it as a gift] alone, as he sees fit, and establish whatever conditions he desires.

Just as it is permitted to sell a synagogue, it is permitted to give it away as a present. If the community had not received any benefit from giving it as a gift, it would not have given it. However, it cannot be rented or given as security. Similarly, when a synagogue is being torn down so that it can be rebuilt, it is permitted to sell the bricks, timber, and soil, exchange them, or give them as gifts. However, it is forbidden to lend them, since their sanctity only departs in return for money or benefit which is equivalent to money.

Although the people pray in a city's main street on fast days and ma'amadot, because too many people gather to fit within a synagogue, [the street] does not possess any quality of sanctity, because [praying there is only a temporary measure] and it is not established as a place of prayer. Similarly, buildings and courtyards where people gather to pray do not possess any measure of sanctity, because they were not designated for prayer alone. Rather, [people] pray within them as a temporary measure, as a person prays within his home.