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The Mūlasarvāstivāda (Sanskrit: मूलसर्वास्तिवाद; traditional Chinese: 根本說一切有部; ; pinyin: Gēnběn Shuō Yīqièyǒu Bù) was one of the early Buddhist schools of India. The origins of the Mūlasarvāstivāda and their relationship to the Sarvāstivāda sect still remain largely unknown, although various theories exist.
The continuity of the Mūlasarvāstivāda monastic order remains in Tibetan Buddhism, although until recently, only Mūlasarvāstivādin bhikṣus (monks) existed: the bhikṣuṇī order had never been introduced.
The relationship of the Mūlasarvāstivāda to the Sarvāstivāda school is a matter of dispute; modern scholars lean towards classifying them as independent. Yijing claimed that they derived their name from being an offshoot of Sarvāstivāda, but Buton Rinchen Drub stated that the name was a homage to Sarvāstivāda as the "root" (mūla) of all Buddhist schools. A number of theories have been posited by academics as to how the two are related, which Bhikkhu Sujato summaries as follows:
The uncertainty around this school has led to a number of hypotheses. Frauwallner’s theory holds that the Mūlasarvāstivāda Vinaya is the disciplinary code of an early Buddhist community based in Mathura, which was quite independent in its establishment as a monastic community from the Sarvāstivādins of Kaśmir (although of course this does not mean that they were different in terms of doctrine). Lamotte, opposing Frauwallner, asserts that the Mūlasarvāstivāda Vinaya was a late Kaśmīr compilation made to complete the Sarvāstivādin Vinaya. Warder suggests that the Mūlasarvāstivādins were a later development of the Sarvāstivāda, whose main innovations were literary, the compilation of the large Vinaya and the Saddharmasmṛtyupasthāna Sūtra, which kept the early doctrines but brought the style up to date with contemporary literary developments. Enomoto pulls the rug out from all these theories by asserting that Sarvāstivādin and Mūlasarvāstivādin are really the same. Meanwhile, Willemen, Dessein, and Cox have developed the theory that the Sautrantikas, a branch or tendency within the Sarvāstivādin group of schools, emerged in Gandhāra and Bactria around 200 CE. Although they were the earlier group, they temporarily lost ground to the Kaśmīr Vaibhāśika school due to the political influence of Kaṇiṣka. In later years the Sautrantikas became known as Mūlasarvāstivādins and regained the ascendancy. I have elsewhere given my reasons for disagreeing with the theories of Enomoto and Willemen et al. Neither Warder nor Lamotte give sufficient evidence to back up their theories. We are left with Frauwallner's theory, which in this respect has stood the test of time.
According to Gregory Schopen, the Mūlasarvāstivāda developed during the 2nd century CE and went into decline in India by the 7th century.
The Mūlasarvāstivāda were prevalent at times throughout Central Asia due to missionary activities performed in the region. A number of scholars identify three distinct major phases of missionary activities seen in the history of Buddhism in Central Asia, which are associated with the following sects chronologically:
In the 7th century, Yijing writes that the Mūlasarvāstivāda were prominent throughout the kingdom of Śrīvijaya (modern day Indonesia). Yijing stayed in Śrīvijaya for six to seven years, during which time he studied Sanskrit and translated Sanskrit texts into Chinese. Yijing states that the Mūlasarvāstivāda vinaya was almost universally adopted in this area. He writes that the subjects studied, as well as the rules and ceremonies, were essentially the same in this region as they were in India. Yijing described these islands as generally "Hīnayāna" in orientation, but writes that the Melayu Kingdom included Mahāyāna teachings such as Asaṅga's Yogācārabhūmi Śāstra.
The Mūlasarvāstivāda vinaya is one of three surviving vinaya lineages, along with the Dharmaguptaka and Theravāda. The Tibetan Emperor Ralpacan restricted Buddhist ordination to the Mūlasarvāstivādin vinaya. As Mongolian Buddhism was introduced from Tibet, Mongolian ordination follows this rule as well.
The Mūlasarvāstivāda Vinaya is extant in Tibetan (9th century translation) and Chinese (8th century translation), and to some extent in the original Sanskrit.