The mosque, six kilometers east of Qom, has long been a sacred place, at least since 373 A.H., 17th of Ramadan, when according to the mosque website, one Sheikh Hassan ibn Muthlih Jamkarani is reported to have met Muhammad al-Mahdi along with the prophetAl-Khidr. Jamkarani was instructed that the land they were on was "noble" and that the owner — Hasan bin Muslim — was to cease cultivating it and finance the building of a mosque on it from the earnings he had accumulated from farming the land. Sometime in the decade of 1995-2005, the mosque's reputation spread, and many pilgrims, particularly young people, began to come to it. In the rear of the mosque, there is a "well of requests" where it is believed the Twelfth Imam once "became miraculously unhidden for a brief shining moment of loving communion with his Creator." Pilgrims tie small strings in a knot around the grids covering the holy well, which they hope will be received by the Imam Mahdi. Every morning custodians cut off the strings from the previous day. Tuesday night is especially popular as it is said to be "the day the vision appeared and therefore the day of the week that , although invisible, takes requests." The gathering "resembles a huge tailgate party where vendors set up in the parking lots and families set up picnic rugs and tens of thousands wander about the grounds as if waiting for the main event to happen." More than a hundred thousand pilgrims sometimes pray outside the overflowing mosque for Maghrib prayer. In keeping with separation of the sexes, women are separated from men in their own special cordoned-off area and also have their own well. Also on Tuesdays, the mosque kitchen provides a free evening meal to thousands of poor people. One of the first acts of the government of President Mahmoud Ahmadinejad was to donate £10 million to the mosque, to fund plans to turn "the normal-sized Jamkaran mosque into a massive complex of prayer halls, minarets, car parks and ablutions." In recent years, overseers of the Jamkaran compound have become sensitive to its foreign images and have restricted foreign press from the main mosque and well. On 4 January 2020, a blood-red flag symbolizing vengeance unfurled above the dome in response to the 2020 Baghdad International Airport airstrike. However, usually the red flag is raised during Muharram.
