Guru Granth Sahib Ji was written because all the 10 Guru's Wanted their teachings lessons culture religion etc. to be passed down to every coming generation. Another reason was because they knew that they're wouldn't be a guru forever so they created the Guru Granth Sahib so that people can always remember the gurus teaching's
The Guru Granth Sahib is just like a - Bible for the Christian People.
Also Guru Gobind Singh Ji wanted a non living Guru to pass on their teachings
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