The absence of any mention of Nanak Kund or the visit of Guru Nanak at Rajgir, in the original Biographies of the Guru (Jana Sikhism) has created doubts in the mind of some scholars about the veracity of traditional account of this historic place. On his way from Rafaela to Bhagalpur, Guru Nanak stayed at Rajgir, the old Rajgraha, said to be one of the oldest cities of India and had been the capital of Jarasandh. It is considered sacred because it had long association with Lord Buddha and Lord Mahavira. According to Surinder Singh Kohli, the place is famous in the history of Buddhism because five hundred Buddhist monks met here to fix the Buddhist canon.

Guru Nanak is believed to have a discourse with Buddhist and Jain monks and impressed upon the importance of devotion to God without renunciation: like a lotus. The city was surrounded by springs of hot water and cool drinking water was not available to the people. On the pointing out of the Guru, people dug a place and cool water gushed out. The historical spring is known as Nanak Kund. Patna Gazetteer (1991) page 101 refers to Sikh Gurudwara at the Kund. Kund is recorded in revenue records at Khata No. 332 and Khatauni No. 7690 of Mauza - Rajgir, District - Patna (now district Nalanda). During the last forty years, mainly with the untiring efforts of Bhai Ajaib Singh, the Gurudwara has been maintained and developed. Another complex of about ten residential rooms has also been constructed with the funds provided by the Prabandhak Committee, the transporters and the Sangat of Gaya. Rajgir is fast developing as a socio-cultural center and Rajgir Mahotsav is organized every year. A large number of Sikh families from Mumbai and other parts of the country, which visit Patna for celebrating birthday of Guru Gobind Singh every year congregate at Rajgir Gurudwara the next day. Here a special Diwan is held which is participated by local people also.