Is the prayer valid in a mosque that contains a grave inside a room?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: There is a grave in the courtyard of a mosque, and a room has been built over this grave, with the grave inside the room. The question is: Is the prayer valid in this mosque?

Answer:
Whether it is inside the mosque, in a room, or exposed, it is not permissible to pray in a mosque that contains a grave, even if the grave is inside a room.