the purified and reconstituted Sikh (Sikhism) community instituted by Guru Gobind Singh on March 30, 1699 (Baisakhi Day; Khalsa Sikhs celebrate the birth of the order on April 13 of each year). His declaration had three dimensions: it redefined the concept of authority within the Sikh community; it introduced a new initiation ceremony and code of conduct; and it provided the community with a new religious and political vision. Khalsa is used to denote both the body of initiated Sikhs and the community of all Sikhs.

The early Sikh community had been shaped by three levels of authority: the masands (“Guru's deputies”) were responsible for local congregations; the Guru (Gurū) was the active central authority; and the revealed word as recorded in Sikh scriptural text served as the symbolic base. With the establishment of the Khalsa, the authority of the masands was eliminated. They were expected either to become members of the community on a par with all others or to leave the fold.

Gobind Singh also introduced a new initation rite. More commonly called amrit pahul (“the nectar ceremony”) but also known as khande ki pahul (literally, “ceremony of the double-edged sword”), it was centred on a belief in the transformative power of the revealed word. The word was recited while water for initiation was stirred with a double-edged sword. Every Sikh who underwent the ceremony became a member of the Khalsa, was assigned the name Singh (“Lion”), and was expected to observe a rigorous code of conduct (rahit) symbolized by the wearing of five items: kes (long hair), kangha (a comb), kachha (a pair of shorts), karha (a steel bracelet), and kirpan (a sword). The names of these items begin with the Punjabi letter k and thus came to be known as the five Ks. The Singhs were also expected to forswear tobacco, alcohol, and certain types of meat.

In its third aspect the Khalsa embodied a concrete political agenda: the pledge to realize the rule of the Sikh community (Khalsa Raj, “kingdom of God”) in the Punjab. These three interlocking dimensions have made the institution of the Khalsa perhaps the most powerful force in shaping Sikh identity during the past three centuries. Initially a male institution, it is now open to women (who take the name Kaur 【“Princess】) as well, though Khalsa authority remains firmly in male hands.