“Attributed to Guru Nanak, in the Janamsakhi of Bhai Bala. As quoted in 'Guru Granth Sahib: A Model For Interfaith Understanding,' by and quote translated by Dr. Kazi Nurul Islam, published in Khalsa Samachar Volume 22 Issue 43, New Delhi, August 30th, 2012 to September 5th, 2012, page. 8 Viewable here:”
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Source: Wikiquote