The Ten Sikh Gurus
Guru Nanak received a Hukam (commandment) from God instructing him to spread a message of truth based on devotion to One God, honesty, and compassion. The soul of Guru Nanak passed on to nine successors, who elaborated on the first Guru’s teachings to give form to this new religion. The final form was given by the tenth and last Guru, Gobind Singh, who started the Sikh initiation ceremony: initiated Sikhs formed a community of saint-soldiers known as Khalsa, the Pure Ones. Guru Gobind Singh also made it clear that, after him, the Guru-eternal for Sikhs would be their holy scripture, Guru Granth Sahib.
*Source The Holy Sikh Scriptures Sri Guru Granth Sahib (Sikh Parade- Special Anniversary Issue)