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DHUBRI (26° 2`N, 89° 55`E). on the right bank of the River Brahmputra, in Assam, is sacred to the memory of Guru Nanak and of Guru Tegh Bahadur. Assam in Indian legend and history has been the land of black magic. Janam Sakhis record how at the time of Guru Nanak`s visit, his constant companion and follower, Mardana, fell into the clutches of a sorceress who transformed him into a ram, and how the Guru not only rescued him but also reformed the woman practising witchcraft.