The Japuji Sahib of the Guru Granth Sahib says, "The Guru is Shiva, the Guru is Vishnu and Brahma; the Guru is Paarvati and Lakhshmi." In the same chapter, it also says, "Shiva speaks, and the Siddhas listen." In Dasam Granth, Guru Gobind Singh has mentioned two avtars of Rudra: Dattatreya Avtar and Parasnath Avtar.