The ruling on praying on the roof of the Ka'bah

Question:
Honorable Shaykh, it has been said that it is not valid to pray on the roof of the Ka'bah, and the reason is that one would not be facing the qiblah. What is your answer?

Answer:
This is if he is praying at the wall, at the wall of the roof, on top of the roof. In that case, there is nothing of the Ka'bah in front of him. But if he is praying in the middle of the Ka'bah, there is no doubt that the Ka'bah is in front of him from all sides. Its air is sufficient; its air is sufficient. And for this reason, it is valid in an airplane and valid on Mount Abi Qubays, which is higher than the Ka'bah in terms of facing the air. Yes. So if the one praying is on the back of the Ka'bah, facing away from it, and there is nothing in front of him but the wall, they say his prayer is not valid because he is not facing any part of it.
But if he is praying in the middle of it or inside it, there is no harm, because he is facing its air or its wall.