Khalsa

noun

the body or company of fully initiated Sikhs, to which devout orthodox Sikhs are ritually admitted at puberty. The Khalsa was founded in 1699 by the last Guru (Gobind Singh). Members show their allegiance by five signs (called the five Ks): kangha (comb), kara (steel bangle), kesh (uncut hair, covered by a turban, and beard), kirpan (short sword) and kuccha (short trousers, originally for riding).

via Urdu from Persian, from the feminine form of Arabic ḵāliṣ ‘pure, belonging to’.