The Bayt-al-Ma'mur is a Quranic descriptive combination, meaning prosperous home, and in Surah al-ttur God has sworn to it once after three other oaths. In the view of most commentators, Bayt-al-Ma'mur has the ability to have equal importance with Bayt-ul-Haram. This combination has not been used in the Pre- Islamic literature and is mentioned in The Quran for the first time. Different views have been expressed about this combination from the Commentators of the two paths of Shia and Sunni: some believe it is on the earth and it is The Ka'ba or the heart of the believers. Others believe it is in heaven; in the world’s sky or the fourth or seventh heaven. The narrations in this regard are not complicit either. It seems that the dominating view of the two paths of Shia and Sunni is that the Baytal- Ma'mur is in the fourth heaven and is aligned with The Ka'ba. It is also prosperous because of the pilgrimage of a large number of angels. Some narrations stipulate the revelation of the Quran on Bayt-al-Ma'mur in the month of Ramadan, which has no explanation except the immediate revelation of the Quran.  Therefore in this descriptive-analytic study it has been attempted to investigate and analyze that in the view of the commentators of Shia and Sunni, what and where The Bayt-al-Ma'mur is, however, with the application of narrations.