Intro
Bait-ud-Dua (house of prayers) is small room that can barely fit 15 people (see at the 9:17 mark). In 1885, MGA was sleeping in this very room, which was a bathroom at that time and was allegedly to have had the incident of the red drops herein. In those days, this room was a toilet room.

In 1903, the ground toilet was most likely ripped out. Lahori-Ahmadi’s claim that Shaikh Rahmatullah paid for the remodeling of Bait-ud-Dua. Later, the floor of the room was raised to the level of the rest of the mosque and this became the office of Maulvi Muhammad Ali. After 1914, it seems that 2nd Khalifa was also fond of this room and would spend many hours therein. Ahmadiyya sources tell us that he would come out with eyes red and swollen. Bait ud Dua is at the eastern end of Masjid Mubarak. The Bait-ul Fikr is right down the hall, on the opposite side (the extreme western end of the temple. It seems to have been called Bait ud Dua after 1920.

_____________________________________________________________________________________________SEERATUL MAHDI. PAGE NO 72 PART I STORY NO 100

“””NARRATED TO ME BY MIAN ABDULLAH SINAURI THAT IT WAS ABOUT MAY JUNE 1884, ONE MORNING AFTER OFFERING FAJAR PRAYER AT MASJID MUBARAK HAZRAT SAHAB (MGAQ) WENT INTO THE ATTACHED BATH ROOM WHICH WAS COLD DUE TO RECENT PLASTER WORK. THERE WAS A CHARPOY AND HAZRAT SAHAB LIED ON IT. I STARTED LEG MASSAGE. SUDDENLY I FOUND A RED SPOT ON HIS SHIN AND SHIRT. I TOUCHED IT THINKING IT TO BE BLOOD, SNIFFED IT BUT IT WAS NOT PERFUMED. THEN I ASKED MGAQ WHO TOLD THE WHOLE STORY OF HIS MEETING WITH ALLAH.”””

The scan from Seeratul Mahdi

______________________________________________________________________________________________Mujadid e Azim mentions this story in the 1930’s by Dr. Basharat Ahmad (Lahori-Ahmadi), the abridged english version
(see page 166-171)

“””On the eastern extremity of the mosque was another small room in which the Divine sign of the red drops occurred. The floor of this room was about two feet lower than the rest of the mosque and contained the requirements for performing ablution. Later, the floor of the room was raised to the level of the rest of the mosque and this cubbyhole became the office of Maulvi Muhammad Ali. During the summer months, the evening prayers were offered on the roof of the mosque. On the west side of the roof was a balcony in which Hazrat Mirza sat after the early evening (Maghrib) prayers and the congregation would gather around him for talk and discussions.”””

Some additional scans
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1939

The Oct-1939 edition of the ROR discusses Masjid Mubarak. 
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Alfazal Vol: 44, No: 247, Oct 22, 1955

“”””Promised Messiah (peace and blessings of Allah be upon him) passed away. After his death mother took me to ‘Bait-ud-Dua’ and placed before me copy of revelation of the Promised Messiah and said this is your biggest heritage. I saw these revelations and in it was a revelation relating to your progeny (Urdu): That which is due to the children is contained in themselves. Meaning of this was that right relating to land and property is not that valuable. More valuable is that Allah has endowed your progeny with ability that if they use it they will become the leader of the world. …. And this is the heritage which We have permanently placed in their mind.”””
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Links and Related Essay’s

The story of the red drops in Ahmadiyya (1884)

What is Baitul-Fikr?

https://ahmadiyyafactcheckblog.com/2018/04/27/who-is-shaikh-rahmatullah-the-famous-lahori-ahmadi/

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