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Based on the sutras, the Vinaya and later commentaries
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Devadatta makes five demands and splits the Sangha

Attested across multiple schools

After conferring with and others, asks the Buddha for five things: that monastics should live in the forest for life, live only on alms, wear only robes made of rags, sit only at the foot of trees, and eat no fish or meat; the Buddha does not consent. Devadatta announces abroad that the Buddha does not allow these five things, and on an he rises and distributes voting sticks for all to declare their position; five hundred newly ordained Vajjian monks from take the sticks and follow him to , and the Sangha is thus split. The Buddha says that the retribution for splitting the Sangha is suffering for a kappa (an immensely long age), and answers on what counts as splitting the Sangha; this event is recorded by five schools.

Different Accounts

The content of the five things: the Pali Vinaya as above; the Chinese Mahīśāsaka Vinaya has no salt, no ghee or milk, no fish or meat, and so on.

More differences between accounts (2)

Destination: the Pali Vinaya and the Chinese Dharmaguptaka Vinaya have Gayāsīsa; the Chinese Mahāsāṃghika Vinaya has “set out towards the city of ”.

Timing: the later Pali commentaries on the Vinaya say the split of the Sangha took place in the Buddha's later years; the tabulations of modern scholars give the Buddha's age as seventy-two.

Dating

Around Year 38 after the Awakening, the Buddha aged about seventy-two; the possible range is Years 38 to 45 after the Awakening, since it must fall after 's accession and while and were still alive (on the alternative reckoning of Ajātasattu's accession, Year 37 at the earliest). The canonical texts state that it was on an uposatha day but do not say in which year; the year is inferred from the sequence of events and is not certain.

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Research Notes: Reliability, Dating and Sources
How Reliability Is Assessed

Recorded by five schools: the Pali canon of the Southern tradition, the Chinese Dharmaguptaka Vinaya (Sifen lü), the Chinese Mahīśāsaka Vinaya (Wufen lü), the Chinese Mahāsāṃghika Vinaya and the Chinese Sarvāstivāda Vinaya (Shisong lü). Attested across multiple schools.

Dating Evidence and Precision

Commentarial dating (the canonical texts give no date; later commentaries record it); converted from the Buddha's age (reckoned from the Buddha's age). Time precision: year uncertain, fixed to the day.

Sources

Back to Year 38 after the Awakening · The Buddha at 72

Source text

日期怎麼讀

成道第幾年
從佛陀成道開始,每經過一次雨季安居算一年,每一年算到安居結束為止;所有年歲一律依二十九歲出家、三十五歲成道推算。
年份依據
區分經文自己明記、後世註解書記載、先後順序推定及年歲換算。
時間精確度
分別說明確定到日、月、年,或只能放入某幾年之間。
可信度
多派共傳、兩派記載、單派記載與後世補述,表達記載的共傳範圍;與時間及位置是否確定分開閱讀。