The Prātimokṣa (Sanskrit prātimokṣa) is a list of rules (contained within the vinaya) governing the behaviour of Buddhist monastics (monks or bhikṣus and nuns or bhikṣuṇīs). Prāti means "towards" and mokṣa means "liberation" from cyclic existence (saṃsāra).
It became customary to recite these rules once a fortnight at a meeting of the sangha during which confession would traditionally take place. A number of prātimokṣa codes are extant, including those contained in the Theravāda, Mahāsāṃghika, Mahīśāsaka, Dharmaguptaka, Sarvāstivāda and Mūlasarvāstivāda vinayas. Prātimokṣa texts may also circulate in separate prātimokṣa sūtras, which are extracts from their respective vinayas.
The Prātimokṣa belongs to the Vinaya of the Buddhist doctrine and is seen as the very basis of Buddhism. On the basis of the Prātimokṣa there exist in Mahayana Buddhism two additional set of vows: The Bodhisattva vows and the Vajrayana vows. If these two set of vows are not broken, they are regarded as carrying over to future lives.
The Prātimokṣa is traditionally a section of the Vinaya. The Theravada Vinaya is preserved in the Pāli Canon in the Vinaya Piṭaka. The Mūlasarvāstivāda Vinaya is preserved in both the Tibetan Buddhist canon in the Kangyur, in a Chinese edition, and in an incomplete Sanskrit manuscript. Some other complete vinaya texts are preserved in the Chinese Buddhist canon (see: Taishō Tripiṭaka), and these include: