Sadna Qasai—Sadna the Butcher—was a real person who lived and died in Sirhind sometime in the 13th century (he was born in Sindh). While a butcher, Sadna was also a philosopher, a poet and a mystic, whose words have even found their way into the Guru Granth Sahib. There are various myths and legends connected to Sadna Qasai as well, all eventually painting him as a figure to be revered. The Mosque of Sadna Qasai was not actually built by him or even during his lifetime, but is believed to have been built in Mughal times in Sirhind. This is a mosque with three bays and two domes, with the larger central dome having since collapsed (there is no roof in the central part, or liwan, of the mosque). In front of the mosque, beautiful pink-flowering frangipani trees stand around a hauz or water tank (now dry) and beyond is the façade of the mosque. Inside, only the central bay of the three bays can be entered safely. One bay is locked, the other bay is very dusty and dirty—and had a ferocious stray dog in it. The central bay, though, is interesting. The walls are made of an unusual gray igneous stone, arranged into squinches at corners by placing cubes of the stone strategically, one atop the other. The mihrab is a huge one, made of brick and covered with a reddish plaster.

The Mosque of Sadhana Kasai is one of the most ancient mosques of India. It is located in the north-western region of the Sirhind-Ropar railway line and is presently under the control of the Archaeological Survey of India. This mosque was dedicated to Bhagat Sadhana, who is also popularly known as Sadhana Kasai (Qasai). He was a renowned Muslim poet, mystic and saint. The entire structure of this mosque is built using Sirhindi bricks and boasts of beautiful Mughal architecture. The paintings on display in the mosque are representations of the ‘T’ art form. A Shabad of Sadhana Kasai is also included in the holy book of the Sikhs, Guru Granth Sahib.