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Based on the sutras, the Vinaya and later commentaries
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Devadatta plots against the Buddha's life: assassins, a boulder and a drunken elephant

Attested across multiple schools

Using 's power, makes several attempts on the Buddha's life, none of which succeed. At Devadatta's request Ajātasattu sends men to assassinate the Buddha, and sends further men in layers to silence them; but on seeing the Buddha the assassins are seized with fear, the Buddha gives each group a graduated teaching, and they attain the and as male . Devadatta then climbs and pushes down a great boulder; the rock is caught by the crags, but a splinter wounds the Buddha's foot and draws blood. He also has the mahouts release the drunken elephant Nāḷāgiri on the road the Buddha is taking, and the Buddha subdues the elephant with loving-kindness. The plot against the Buddha's life is found in the Vinaya texts of four schools; the boulder and the drunken elephant each in three.

Different Accounts

Who stopped the boulder: the Chinese Mahīśāsaka Vinaya has the spirit Jinbilu catch the rock and throw it far away, a splinter wounding the Buddha's big toe; the Chinese Sarvāstivāda Vinaya has the yakkha Kumbhīra catch it with both hands; the Pali Vinaya has two peaks of the mountain close together to block it.

More differences between accounts (3)

The drunken elephant: the Pali Vinaya names it Nāḷāgiri; the Chinese Mahīśāsaka Vinaya calls it King Ajātasattu's great fierce elephant and places its release before the boulder; the Saṅghabhedavastu of the Chinese Mūlasarvāstivāda Vinaya calls it the great elephant Hucai (Dhanapāla, “Guardian of Wealth”).

Number of assassins: the Pali Vinaya has one sent first, then two, four, eight and sixteen; the Chinese Dharmaguptaka Vinaya has two sent first, then four.

The Pali Vinaya records the Buddha saying that drawing the Buddha's blood was the first “deed of immediate retribution” (the gravest class of evil deed) committed by Devadatta.

Dating

Around Year 38 after the Awakening, the Buddha aged about seventy-two, after 's abdication; the canonical texts say only that it was in the Buddha's later years, and the year is inferred from the year of Ajātasattu's accession; the season is unknown; 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

The episode of “Devadatta plots against the Buddha” is recorded by four schools, the Pali canon of the Southern tradition, the Chinese Dharmaguptaka Vinaya (Sifen lü), the Chinese Mahīśāsaka Vinaya (Wufen lü) and the Chinese Sarvāstivāda Vinaya (Shisong lü). Attested across multiple schools. Within it, “the boulder wounds the foot” is recorded by three schools; “the drunken elephant is released” is recorded by three 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。