Claim: Dasam Granthis, a holy book in Sikhism with compositions attributed to Guru Gobind Singh, is written almost entirely Gurmukhi (except for the Guru Gobind Singh's letters to Aurangzeb—Zafarnama and the Hikaaitaan—written in the Persian alphabet), includes hymns, mythological tales from Hindu texts, a celebration of the feminine in the form of goddess Durga, erotic fables, an autobiography, letters to others such as the Mughal emperor, as well as reverential discussion of warriors and theology.
Evidence: The Dasam Granth (Gurmukhi: ਦਸਮ ਗ੍ਰੰਥ, lit. 
The Dasam Granth includes hymns, mythological tales from Hindu texts, a celebration of the feminine in the form of goddess Durga, erotic fables, an autobiography, letters to others such as the Mughal emperor, as well as reverential discussion of warriors and theology. 
Such compositions of the Dasam Granth include Jaap Sahib, Tav-Prasad Savaiye and Benti Chaupai which are part of the Nitnem or daily prayers and also part of the Amrit Sanchar or baptism ceremony of Khalsa Sikhs.