What is the ruling on praying in a mosque that contains a shrine?

Question:
He says: There is a shrine in a specific, well-known area, and people come to this area to make supplication and ask for the intercession of the one they believe has status and closeness to Allah. Next to this shrine is a mosque named after that shrine. Is it permissible to pray in this mosque?

Answer:
It is not permissible to visit a grave or graves for the sake of seeking blessing, asking for intercession, or seeking status with Allah. This is something the Messenger (peace and blessings be upon him) forbade, because it is a religious innovation (bid'ah) and one of the means of shirk (associating partners with Allah). This is an exaggeration regarding the dead, and it is not permissible. A grave is only visited to greet the deceased and to make supplication for him, i.e., supplication for the dead. However, if the dead person is called upon, or intercession is sought from him, or sustenance is sought from him, this is major shirk. This is supplication to other than Allah the Exalted and Majestic. This action is not permissible, and it is not permissible to pray in a mosque that contains a grave, because the Prophet (peace and blessings be upon him) forbade praying at graves and forbade taking graves as mosques, meaning places of prayer.
And he informed that this is the practice of the Jews and the Christians, and he (peace and blessings be upon him) cursed them. He said: "May the curse of Allah be upon the Jews and the Christians who took the graves of their prophets as mosques. So do not take the graves as mosques, for I forbid you from doing so."