The Sadh is one of the few endogamous religions. They call the God in the name Satnam, which means "the true name". Their population is mainly concentrated in Uttar Pradesh, Uttrakhand, Haryana, Rajasthan and Punjab. It is one of the richest castes in India.
The sect was formed by Birbhan sadhji in Bijesar, a village near Narnaul, Haryana in the year 1543 CE. They use the name Satnami (it means the true name) to call upon the God. Hence, they call themselves as Satnamis.
A major revolt against Aurangzeb, the Mughal Emperor, occurred in Narnaul and surrounding localities in the year 1672, which was led by Sadh people. The revolt was caused by the oppression led by the revenue officials of the Mughal Emperor. The absence from North India of the major proportion of royal troops helped the revolting people to establish a temporary gain and the movement of rebels towards Delhi became a matter of serious concern for the emperor himself. A large reinforcement was sent to contain the revolt and in the following battle thousands of rebels were killed.
The following paragraph is the story of the Sadh origin as per Sadh belief & their holy book. Sadh community has an entire different picture of the creation of Earth, creation of mankind and the entire natural process of everything we see and do in our life. They believe in the supreme power which is above all other Hindu deities, "Sat Avgat" literal meaning: sat se avgat hona; for them it is the true creator. Sadh community pray to their creator "Satgur Saheb". Rumors have it that this sect was started by Birbhan Sadh but the Sadh holy book "Nirvaan Gyaan" has mentioned that with the wish and command of "Satgur Saheb" the creation of Earth & mankind took place and everyone was Sadh at the beginning of time, it is what the people did and believed in& karma and their own doing led to the creation of different religions and sects. Their Holy book "Nirvaan Gyaan" has kadas which have the entire details from the day of creation and further. The book also contains rules and regulations in the form of Bani's(Shlokas) a Sadh should follow. It also mentions ways by which a Sadh or any person could attain moksha.