It is known that prayer in a mosque that contains a grave is not valid, so what is the criterion for a mosque containing a grave?

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: It is known that prayer in a mosque that contains a grave is not valid, so what is the criterion for a mosque containing a grave, and does the proximity of the grave to the mosque affect this?

Answer:
A mosque is considered to be on a grave if it is connected to it, with no path or open space between them. As for if the wall of the grave is by the wall of the mosque, this is connected to it, whether it is from the back, from the front, on the right, or on the left. This is a grave connected to the mosque. This is a mosque on a grave. Yes. As for if it is separate, outside the mosque, either by a street, or by an open space, or by any barrier that separates the mosque from the grave with a wide separation, a wall alone is not a separation; an open space, a street, houses, or something like that is required. Yes.