Congregation Outside the Mosque out of Necessity When There Is No Room in It
Question
When the former mosque has been demolished and there is not enough room in it, on the floor and so on, for the prayer to be performed in congregation, will there be the reward of the mosque in praying in congregation in some other place or in a house? What is the Shari‘a ruling?
Answer
If there is no room even in the courtyard and the like belonging to the mosque, then in a state of necessity, wherever the congregation is held in place of the mosque, the reward of the mosque will be obtained, in sha’ Allah.
Source: Fatawa Mahmudiyya
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