Guru Tegh Bahadur in the context of "Sects of Sikhism"

Guru Gobind Singh (Punjabi pronunciation: [gʊɾuː goːbɪn̪d̪ᵊ sɪ́ŋgᵊ]; born Gobind Das; 22 December 1666 – 7 October 1708) was the tenth and last human Sikh Guru. He was a warrior, poet, and philosopher. In 1675, at the age of nine, he was formally made the leader of the Sikhs after his father Guru Tegh Bahadur—the ninth Sikh Guru—was executed by the emperor Aurangzeb. His four biological sons died during his lifetime—two in battle and two executed by the Mughal administrator Wazir Khan.

Among his notable contributions to Sikhism are founding the Sikh warrior community called Khalsa in 1699 and introducing the Five Ks, the five articles of faith that Khalsa Sikhs wear at all times. Guru Gobind Singh is credited with the Dasam Granth whose hymns are a sacred part of Sikh prayers and Khalsa rituals. He is also credited as the one who finalized and enshrined the Guru Granth Sahib as Sikhism's primary holy religious scripture and the eternal Guru. He also established the concept of Guru Panth as his spiritual successor, however this manner of guruship is seldom evoked today.

The Guru Granth Sahib (Punjabi: ਗੁਰੂ ਗ੍ਰੰਥ ਸਾਹਿਬ, pronounced [ɡʊɾuː ɡɾənt̪ʰᵊ säː(ɦ)(ɪ)bᵊ(˦)]) is the central holy religious scripture of Sikhism, regarded by Sikhs as the final, sovereign and eternal Guru following the lineage of the ten human gurus of the religion.

The Adi Granth (Punjabi: ਆਦਿ ਗ੍ਰੰਥ), its first rendition, was compiled by the fifth guru, Guru Arjan (1564–1606). Its compilation was completed on 29 August 1604 and first installed inside the Golden Temple in Amritsar on 1 September 1604. Baba Buddha was appointed the first Granthi of the Golden Temple. Shortly afterwards Guru Hargobind added Ramkali Ki Vaar. Later, Guru Gobind Singh, the tenth Sikh guru, added hymns of Guru Tegh Bahadur to the Adi Granth and affirmed the text as his successor. This second rendition became known as the Guru Granth Sahib and is also sometimes referred to as the Adi Granth.

The term Khālsā (Punjabi: ਖਾਲਸਾ, pronounced [kʰaːl(ə̆)saː]) refers to both a community that follows Sikhism as its religion, as well as a special group of initiated Sikhs. The Khalsa tradition was initiated in 1699 by the Tenth Guru of Sikhism, Guru Gobind Singh. Its formation was a key event in the history of Sikhism. The founding of Khalsa is celebrated by Sikhs during the festival of Vaisakhi.

Guru Gobind Singh started the Khalsa tradition after his father, Guru Tegh Bahadur, was beheaded during the rule of the Mughal Emperor Aurangzeb after the Hindu Brahmins requested for his help to save their religion. Guru Gobind Singh created and initiated the Khalsa as a warrior with a duty to protect the innocent from religious persecution. The founding of the Khalsa started a new phase in the Sikh tradition. It formulated an initiation ceremony (amrit sanskar, nectar ceremony) and rules of conduct for the Khalsa warriors. It created a new institution for the temporal leadership of the Sikhs, replacing the earlier Masand system. Additionally, the Khalsa provided a political and religious vision for the Sikh community.

Guru Har Krishan (Gurmukhi: ਗੁਰੂ ਹਰਿ ਕ੍ਰਿਸ਼ਨ, pronunciation: [ɡʊruː həɾ kɾɪʃən]; 7 July 1656–30 March 1664) also known as Bal Guru (Child Guru), or Hari Krishan Sahib, was the eighth of the ten Sikh gurus. At the age of five, he succeeded his father, Guru Har Rai, and became the youngest guru in Sikhism. He contracted smallpox in 1664 and died before reaching his eighth birthday, with the shortest reign as guru, lasting only two years, five months, and 24 days.

He is remembered in the Sikh tradition for saying "Baba Bakale" before he died, which Sikhs interpreted to identify his grand-uncle Guru Tegh Bahadur as his successor.