The ruling on praying in mosques that contain graves

Question:
The questioner says: In some countries, there are graves inside their mosques. They are not tombs of great significance, but they have become a place of visitation. Is it permissible to pray in them?

Answer:
If what is in them are dead people, then they are merely stones and are not considered shrines. However, I do not think there is anything of this kind, nor is there a grave in it, except for what is said about the grave of al-Husayn, which is a lie, because al-Husayn did not go to Egypt, and the head of al-Husayn did not go to Egypt, and nothing of al-Husayn is in Egypt (may Allah be pleased with him). Rather, he was buried in Iraq in Karbala; he was buried in Karbala, yes, he was buried in Karbala, the place where he was killed. It is said that his head was carried to al-Shat, and Allah knows best. The point is that he did not go to Egypt. Some people say, no, the one in the grave is not al-Husayn; he has