New Delhi, April 8 Prime Minister Narendra Modi on Thursday called for extensive research and documentation of the Sikh spirit of service worldwide and the evolution of Gurdwaras as the living centres of community service. Addressing the high-level committee meeting to plan the 400th birth anniversary of Guru Tegh Bahadur virtually on Thursday, the PM said the government will give a fitting tribute to the ninth Sikh Guru whose life was an example of supreme sacrifice and wisdom. “The occasion to mark the Parkash Purab of Guru Tegh Bahadur is a spiritual privilege and national duty. We have been blessed by the Gurus to be able to contribute to this historical occasion,” the PM said seeking detailed written suggestions from the committee members on the various aspects of the year-long celebrations the government plans.