Things Not Permissable In A Mosque

It is makruh [1] to lock the doors of a mosque. It is not makruh if there is a danger of thieves.

It is permissible to walk through a mosque sometimes. But it is makruh to make it your regular route. It is not makruh if there is a good reason to do so.

It is makruh to bring najasat [2] into a mosque. A person who has najasat on his person cannot enter a mosque.

It is makruh to plaster a mosque with mortar or mud made with najs [3] water.

It is haram [4] to let mad people or small children who will bring najasat into a mosque enter the mosque. It is makruh if there is no danger of najasat.

It is tahrimi makruh [5] to set up markets, to talk loudly, to make speeches, to quarrel, to take up arms, and to punish others in a mosque.

It is makruh to enter a mosque with na'ls, i. e. shoes worn outdoors.

It is haram to importune (for money) in a mosque.

It is fard-i kifaya [6] for people without an excuse to listen to the Qur'an al karim [7] . It is sinful to begin reading the Qur'an al karim loudly in a place where people are working, sleeping, performing salat or if there is someone preaching.

It is makruh to eat something or to sleep in a mosque. A musafir (visitor) is exempted from this. When entering a mosque, a musafir must intend for I'tikaf [8] and perform the salat of tahiyyatulmasjid [9] first. Thereafter he can eat and talk about worldly matters. Making a contract for buying and selling in a mosque is makruh. Yet it is mustahab [10] to establish a contract for a nikah [11] .

It is tahrimi mekruh to busy with worldly conversations instead of worshipping in a mosque.

[1] makruh: (act, thing) improper, disliked and abstained by the Prophet ('alaihi 's-salam); makruh tahrima: prohibited with much stress.
[2] najasat: i) any kind of dirt, filth, that prevents one from performing namaz. ii) religiously impure thing.
[3] najs: religiously impure thing.
[4] haram: an action, word or thought prohibited by Allahu ta'ala.
[5] makruh-tahrima: The omission of a wâjib (obligatory performance), and it is close to harâm (prohibited). It is a venial sin to do an act which has been declared to be makrûh tahrîmî.
[6] fard kifaya: fard that must be done at least by one Muslim in a community.
[7] Qur'an al-karim: the Holy Koran.
[8] i'tikaf: retreat, religious seclusion during Ramadan.
[9] tahiyya: first prayer recited at the sitting posture in salat.
[10] mustahab: (act, thing) deserving thawab if done but no sin if omitted, nor disbelief if disliked.
[11] nikah: Islamic act of engagement for marriage.