For 10 points, identify this founder and first guru of Sikhism.
A tale of his youth says that this man could not stop praying until he drowned out the cries of a male sparrow. Also as a child, this man explained to his teacher that the straight line which comprises the first letter of the Persian alphabet is a metaphor for the unity of God. This man promulgated the three principles of living honestly, helping others, and ceaseless devotion to God, or naam japna. The earliest accounts of the life of this author of the Muul Mantar declaration of faith are included in the Janamsakhis and Vars written by Bhai Gurdas. He proclaimed "there is no Hindu and no Muslim" before his death in the 1530s, when he turned into a pile of flowers and was succeeded by Angad. For 10 points, identify this founder and first guru of Sikhism.
A tale of his youth says that this man could not stop praying until he drowned out the cries of a male sparrow.
Guru Nanak Dev Ji