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Based on the sutras, the Vinaya and later commentaries
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Devadatta wins the devotion of Prince Ajātasattu with his supernormal powers

Attested across multiple schools

considers whom he should first win over; thinking that Prince is young and has a bright future, he turns himself into a child with a snake wound about its waist, appears on the prince's lap, and then resumes the form of a monastic. The prince is delighted, and goes to attend on him morning and evening every day with five hundred carriages, offering five hundred pots of food. The Buddha tells the that with these offerings Devadatta's wholesome practice can only decline, just as the plantain, the bamboo and the reed are destroyed by bearing their own fruit. This event is found in the of three schools.

Different Accounts

The Chinese Dharmaguptaka Vinaya has a different order: it first records that Devadatta lost his supernormal powers through greed for offerings and envy, then that he asked the Buddha to hand the Sangha over to him, and only after that that he incited Ajātasattu to kill his father.

More differences between accounts (2)

The Chinese Sarvāstivāda Vinaya says that for twelve years after his going forth Devadatta practised with a good heart, and only then turned to evil; the Pali Vinaya has no such number of years.

The Saṅghabhedavastu of the Chinese Mūlasarvāstivāda Vinaya gives Devadatta's motive as: when the king dies the crown prince will become king, so he should be won over first.

Dating

Around Year 38 after the Awakening, the Buddha aged seventy-two; the canonical texts say only that it was in the Buddha's later years, before the demand to take over the Sangha. It is placed here around Year 38 on the basis of the year of Ajātasattu's accession, the alternative reckoning being Year 37 (the Buddha aged seventy-one); the season is unknown, as is whether it was before or after the ; inferred from the sequence of events, the year is not certain.

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

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

Dating Evidence and Precision

Inferred from the sequence of events (neither the canonical texts nor the commentaries give the time; the year is worked out from the order of this event and those around it); converted from the Buddha's age (reckoned from the Buddha's age). Time precision: year uncertain.

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。