The ruling on praying in mosques built over graves, shrines, and sanctuaries

Question:
He says: Honorable Shaykh, may Allah grant you success, we are callers from Islamic Arab countries, and we have many mosques built over graves, shrines, and sanctuaries. What is the detailed ruling on praying in them? Some of these mosques have the grave inside the mosque, some have it in the back, and some have it to the right or to the left. And how do we call people to leave praying in them or seeking aid from them?

Answer:
You must call people to Allah with wisdom and good instruction, and spread knowledge bit by bit. You take people as far as you can, but bit by bit. Do what you can of calling to Allah with wisdom, good instruction, and kind words.
As for praying in these mosques, do not pray in them. Build yourselves a mosque, or pray in an open space. A built mosque is not necessary; set aside a plot of land for yourselves and pray in it. If you build, that is better. Praise be to Allah, no one is stopping you from building yourselves a mosque or praying in a plot of land. The Messenger (peace and blessings be upon him) said: Yes.