The Sikh gurus (Punjabi: ਸਿੱਖ ਗੁਰੂ; Hindi: सिख गुरु) are the spiritual masters of Sikhism, who established the religion over the course of about two and a half centuries, beginning in 1469.[2] The year 1469 marks the birth of Guru Nanak, the founder of Sikhism. He was succeeded by nine other human gurus until, in 1708, the Guruship was finally passed on by the tenth guru to the holy Sikh scripture, Guru Granth Sahib, which is now considered the living Guru by the followers of the Sikh faith.[3]
Guru (/ˈɡuːruː/, UK also /ˈɡʊruː, ˈɡʊər-/; Sanskrit: गुरु, Punjabi: ਗੁਰੂ, IAST: guru) is a Sanskrit term for a "teacher, guide, expert, or master" of certain knowledge or field.[4] Bhai Vir Singh, in his dictionary of Guru Granth Sahib describes the term Guru as a combination of two separate units: "Gu;(ਗੁ)" meaning darkness and "Rū;(ਰੂ)" which means light.[5] Hence, Guru is who brings light into darkness or in other words, the one who enlightens. Bhai Vir Singh's definition provides further insight about Sikhi itself and explains why Guru Granth Sahib is considered the living Guru. The word Sikh is derived from the Sanskrit term shishya[6] (Punjabi: ਸਿੱਖ) which means a disciple or a student. Thus, Sikhs have a student–teacher relationship with their Gurus since their teachings, written in Guru Granth Sahib, serve as a guide for the Sikhs.
According to Sikh beliefs, all the Gurus contained the same light or soul and their physical body was a vessel for containing the same essence. When one Guru passed, the successor inherited this light and that is why the Gurus are also referred to as mahalla (house).[7]
The author of the Dabistan refers to the belief of the Sikhs in the unity of Guruship. The spirit of Guru Nanak entered the bodies of his successors - Guru Angad, Guru Amar Das, Guru Ram Das and Guru Arjan. That was why each Guru was referred to as mahal: Guru Nanak as the first mahal, Guru Angad as the second mahal, and in this way Guru Arjan as the fifth mahal. A Sikh who does not regard Guru Arjan as Baba Nanak is not a true Sikh. The firm belief of the Sikhs is that all the Gurus are Nanak. Indeed, Bhai Gurdas underscores the unity of Guruship from Guru Nanak to Guru Hargobind in one of his Vaars. This is reiterated in another Vaar in which the metaphors of light and water are used to emphasize that they all are the same.The idea of the unity of Guruship emphasized by Bhai Gurdas legitimized the succession of Guru Hargobind to face the rival claim of Prithi Chand and his descendants.