Beit al-Ma'mour is a house in the fourth or seventh heaven, the sanctuary (equal to or opposite to) the house of the Ka'bah where the angels are always engaged in worship and Tawaf. This combination was first used in the Holy Quran and then in Islamic traditions. Therefore, Beit Al-Ma'mour is not the Kaaba, but is equal to or above the Kaaba in another world. And it is not on earth at all until someone was born in it.
As for the answer to your second question, I must say that in Persian literature, religious concepts and terms have had a significant presence. I have not had much. But the famous ancient poets of Iran according to the official religion at that time were mostly Sunnis and those who were Shiites hid their religion due to piety. And if it became clear that they were Shiites, not only their works and writings, but also their person would be in danger. Therefore, the works of literature of the past cannot be clearly distinguished in terms of being Shiite and Sunni.
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