Musannaf Ibn Abi Shaybah 6304 — Those who permitted that

Mansur says: To the right side of our mosque, lower than the imam, there was a rooftop. During the days of al-Hajjaj's rule, some people who were in hiding used to pray on that rooftop and follow the imam, even though there was a long wall between them and the mosque. I mentioned this to Ibrahim and he considered it good.