Questions on the Explanation of the Book of Nullifiers of Islam

Question:
A grave was found in a mosque, and then the authorities leveled the grave and placed the mosque carpets over it. Is this action correct? And is it permissible to pray in the mosque in this state?

Answer:
This is invalid. This is an invalid action and is not permissible, and it is a disrespect to the grave. The scholars mentioned that if the grave existed before the mosque, then the mosque is demolished and the grave remains. But if the opposite is the case, meaning the mosque existed first and the grave was placed in it afterwards, then the grave is dug up and moved to the cemetery. So, a mosque and a grave never remain together.