http://en.wikipedia.org/wiki/Guru_Gobind_Singh
The rules and guidelines for the Khalsa
Guru Gobind Singh, after administering Amrit to the 'Five Beloved Ones', ordained them to do the following:
I. They must all wear the following articles. The name of each article begins with 'K'. These are known as the 5 Kakkas (the letter in the Gurmukhi alphabet corresponding to 'k'):
Kes - Unshorn hair. This represents the natural appearance of sainthood. This is the first token of the Sikh faith. The Guru called the Khalsa the Sant-Sipahi (Saint-Soldiers)
Kangha - A comb to manage the hair.
Kachha - A pair of underpants.
Kara - An iron bracelet on the wrist.
Kirpan - A sword symbolizing dignity and strength.
II. They must observe the following guidelines. These are known as the Rahatnamas (Codes of Conduct):
Defend the weak or infirm from tyranny and oppression.
Not to remove hair from any part of the body (hair was declared sacred by the Guru).
Not to use Tobacco or other intoxicants (e.g., alcohol).
Not eat meat--this includes Halal or Kosher Meat - ADVANCED STUDIES IN SIKHISM by Jasbir Singh and Harbans Singh.: Hukamnama written by Sri Gobind Singh ji:
"Sarbat sangat Kabul Guru rakhe ga Tusa ute asaadee bahut khusi hai Tusi Khande da Amrit Panja to lena Kes rakhne...ih asadee mohur hair; Kachh, Kirpan da visah nahee karna SARB LOH da kara hath rakhna Dono vakat kesa dee palna karna Sarbat sangat abhakhia da kutha Khave naheen, Tamakoo na vartana Bhadni tatha kanya-maran-vale so mel na rakhe Meene, Massandei, Ramraiye ki sangat na baiso Gurbani parhni...Waheguru, Waheguru japna Guru kee rahat rakhnee Sarbat sangat oopar meri khushi hai.
Patshahi Dasvi Jeth 26, Samat 1756
(To the entire sangat at Kabul. The Guru will protect the Sangat, I am pleased with you all. You should take baptism by the sword, from the Five Beloveds. Keep your hair uncut for this is a seal of the Guru, Accept the use of shorts and a sword. Always wear IRON KARA on your wrist, Keep your hair clean and comb it twice a day. Do not eat Halal (Kosher) meat, Do not use tobacco in any form, Have no connection with those who kill their daughters Or permit the cutting of their children's hair. Do not associate with Meenas, Massands and Ram-raiyas (anti-Sikh cults) Recite the Guru's hymns Meditate on "The Name of our Wonderful Lord", Follow the Sikh code of discipline I give the entire sangat my blessing)
Signature of 10th Guru Jeth 26, 1756 Bikrami (23rd May 1699 A.D)
Not to commit adultery- 'Par nari ki sej, bhul supnehun na jayo' (Never enjoy, even in dream, the bed of a woman other than that of your own wife or husband)
(A supplementary ordinance was issued that anyone who did not observe any of the above four directives must be re-baptized, pay a fine, and promise not to offend any more, or she/he must be excommunicated from the Khalsa.)
III. They must rise at dawn, bathe, meditate on Gurmantar-'Waheguru', Mool Mantar- the preamble of Japji, and recite the five banis- Japji, Jap Sahib and Swayas in the morning; Reh Raas in the evening; and Kirtan Sohela at bed time at night.
IV. They must not worship idols, cemeteries, or cremation grounds, and must believe only in One Immortal God. The Guru further spelled out that they should practice arms, and never show their backs to the foe in the battlefield. They should always be ready to help the poor and protect those who seek their protection. They were to consider their previous castes erased, and deem themselves all brothers of one family.