The earliest biographical sources on the life of Guru Nanak recognized today are the Janamsakhis (life accounts) and the vars (expounding verses) of the scribe Bhai Gurdas. The most popular Janamsakhi are written by a close companion of the Guru, Bhai Bala.
Bhai Gurdas, a purported scribe of the Gur Granth, also wrote about Nanak's life in his vars. Although these too were compiled some time after Guru Nanak's time, they are less detailed than the Janamsakhis. The Janamsakhis recount in minute detail the circumstances of the birth of the guru. The Janamsakhis claim that at his birth an astrologer, who came to write his horoscope, insisted on seeing the child. On seeing the infant, he is said to have worshipped him with clasped hands and remarked that "I regret that I shall never live to see young Guru Nanak as an adult.
At the age of five years Nanak is said to have voiced interest in divine subjects. At age seven, his father, Mehta Kalu, enrolled him at the village school as was the custom. Notable lore recounts that as a child Nanak astonished his teacher by describing the implicit symbolism of the first letter of the alphabet, which is an almost straight stroke in Persian or Arabic, resembling the mathematical version of one, as denoting the unity or oneness of God. Other childhood accounts refer to strange and miraculous events about Nanak witnessed by Rai Bular such as a poisonous cobra being seen to shield the sleeping child's head from the harsh sunlight.
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5. Gurbani : Japji Sahib
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