Guru Har Rai, who initiated him a Sikh, renamed him Bhagat Bhagvan and bestowed upon him what is known in Udasi parlance a bakhshish, i.e. blessing or authority to establish preaching centres for the spread of Sikhism. Bhagat Bhagvan preached in the eastern provinces and set up Udasi deras or monasteries at several places. His disciples and successors spread the teaching of Guru Nanak widely in northern India, from Bihar to Sindh.
References :
1. Randhir Singh, Bhai, L7dasi Sikkhari di Vithia. Amritsar, 1959
2. Ashok, Shamsher Singh, Panjab dfari Lahirari. Patiala, 1974