Vinaya Pitaka Disciplinary and Procedural Rules for the Saṁgha

The Vinaya Pitaka is made up of rules of discipline laid down for regulating the conduct of the Buddha's disciples who have been ad­mitted as bhikkhus and bhikkhus into the Order. These rules em­body authoritative injunctions of the Buddha on modes of conduct and restraints on both physical and verbal actions. They deal with trans­gressions of discipline, and with various categories of restraints and admonitions in accordance with the nature of the offence.

Source: Guide To Tipika by Sayagyi U Ko Lay