The Ardās is not in the Ādi Granth, and only the opening passage (concluding with veneration of Gurū Tegh Bahādur) is attributable to Gurū Gobind Siṅgh. The prayer evolved in the 18th cent., providing insight into contemporary ideals although lines have been added since. It is printed as part of Nitnem. See NIRAṄKĀRĪ; RAVIDĀSĪ.
"Ardās." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (October 16, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/ardas
"Ardās." The Concise Oxford Dictionary of World Religions. . Retrieved October 16, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/ardas