What is the ruling on praying in a mosque that has a grave in it, but the grave is behind the mosque?

Question:
What is the ruling on praying in a mosque that has a grave in it? And what is the ruling if the grave is behind the mosque? We also ask you about the ruling on giving sweets as a gift on the occasion of the Prophet’s (peace and blessings be upon him) birthday?

Answer:
Praying in mosques that contain graves is not permissible. The Messenger (peace and blessings be upon him) said: Aisha (may Allah be pleased with her) said: “He warned against what they did.” She said: “And were it not for that, his grave would have been brought out, meaning to al-Baqi‘, except that he feared it would be taken as a mosque.”
And he (peace and blessings be upon him) said: It was narrated by Muslim in the two Sahihs from Jundub ibn Abdullah al-Bajali.
The Messenger (peace and blessings be upon him) warned against this, and explained that those before us committed this abomination then He forbade them, and He warned us against it.
Therefore, prayer in mosques built over graves is invalid, whether the grave is in front of them, to their right, to their left, or behind them. However, if the grave is outside the mosque, and the mosque is outside of it, the prayer is valid.
As long as the mosque is built over the grave, whether it is placed in front of the worshippers, to their right, to their left, or behind them, no prayer is performed in it. If the grave is the newer one, it is dug up, and the remains of the grave are taken to the public cemetery, and the ground is leveled. But if the mosque is the newer one, built over the grave, it is demolished and removed, and the graves remain exposed to the sun, as they were exposed in the time of the Prophet (peace and blessings be upon him).