Baitul Ma’mur (Arabic: الْبَيْتِ الْمَعْمُورِ) or the “Frequented House” or a house which is situated on the 7th heaven, directly above the Ka’aba on earth. The angels make Tawaf to this House like Hajj or Umrah to Ka’aba. The Ka’aba on earth is a replica of it. Angels perform prayer in the Bait-ul-Ma’mur. Every single day 70,000 angels visit it. This will continue on until the Day of Resurrection.
The house itself is also mentioned in Surah at-Tur, ayath 4, Allah said: “And by the Bait-ul-Ma'mur (the house over the heavens parable to the Ka'bah at Makkah, continuously visited by the angels);” Quran Surah 52:4
The Messenger of Allahﷺ, said narrating about the journey of ‘Isra wal Miraaj, "Then I was shown Al-Bait-al-Ma’mur (i.e. Allah’s House). I asked Gabriel about it and he said, This is Al Bait-ul-Ma’mur where 70,000 angels perform prayers daily and when they leave they never return to it (but always a fresh batch comes into it daily)." Sahih al-Bukhari 3207 and Sahih Muslim 164
He ﷺ also said, Then the Bait-ul-Ma’mur was raised up to me. I said: O Gabriel! what is this? He replied: It is the Bait-ul-Ma’mur. Seventy thousand angels enter into it daily and, after they come out, they never return again. Two vessels were then brought to me. The first one contained wine and the second one contained milk, and both of them were placed before me. I chose milk. It was said: You did right. Allah will guide rightly through you your Ummah on the natural course. Then fifty prayers daily were made obligatory for me. And then he narrated the rest of the hadith to the end.” Sahih al-Bukhari 3207 and Sahih Muslim 164
This indicates their great numbers (of angels) and that only Allah knows how many they are. Hence, we must believe in them generally and specifically as honored creation, not humans or Jinn, but as creatures created from light as related in saheeh ahadeeth.
It is a Masjid like the Kabah, above seven skies. The angels visit it, pray in it, and do Tawaf Each day a fresh batch of 70,000 angels comes to it. Till the Day of Judgement the same batch of angels will not get a chance to return to it again. When this is the number of Allah’s work force, how powerful must Allah (subhana wa ta’ala) be?