What is the ruling on placing a dome over a grave?

Question:
You were asked in the previous lesson about the green dome over the grave of the Prophet (peace and blessings be upon him), and my understanding was too limited to grasp what you mentioned in your answer regarding it, even though I understand the harm that would result from removing it. Is it permissible to place a dome over a roofed grave, as is the case with the grave of the Prophet (peace and blessings be upon him)?

Answer:
It is built, my brother, over one of the graves. It is not permissible to build over a grave. In fact, it is not permissible to build over graves at all. As for the grave of the Messenger (peace and blessings be upon him), he was buried in his house. It was not built over specifically. Rather, he was buried in his house to protect him. It was not that he was buried first and then built over. This is what is not permissible. But he was buried in a built house to protect him, peace and blessings be upon him. Yes.