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yes it was Hindus that killed the Sikh guru
To give ones life for a cause is a difficult and highly challenging undertaking. Many in past human history have given their lives for their own personal reason; however, what is astonishing in the case of the ninth Sikh Guru is the fact that the Guru was not protecting the right of his "own people" called the Sikhs to practise their religion but instead the rights of the non-Sikhs, the peace-loving people from Kashmir.
These people from Kashmir were very respected Hindus pundits (scholars) who were being threatened with conversion to Islam, under the threat of death by the "Muslim" Emperor, Aurangzeb. In 1669, the Mughal ruler Aurangzeb departed from the policy of tolerance practised by his predecessors and unleashed instead a policy of religious persecution against non-Muslims. This caused large-scale demoralisation, fear and panic among the people.
The commitment by the Sikh Guru to protect and support the liberty of all the people of a country was unprecedented. This type of supreme sacrifice had never previously been recorded in human history. On May 25, 1675 in answer to an appeal of a large group of revered Kashmiri Pandits, Guru Tegh Bahadur made the momentous decision that has forever changed the level of moral commitment, dedication and sacrifice required by followers of God.
The Guru made this critical decision to risk laying down his life if necessary to protect the right of the Hindus to follow their religion freely without interference or duress.
Sikhs are with us always remember that
Martyrdom of Guru Tegh Bahadur - SikhiWiki, free Sikh encyclopedia.