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Based on the sutras, the Vinaya and later commentaries
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Gravely ill during the retreat, the Buddha tells his disciples to rely on the Dhamma

Attested across multiple schools

During the retreat the Buddha falls gravely ill, with pains so severe they nearly kill him. Reflecting that it would not be right to pass away without telling his disciples, he holds on to life by force of will, and the illness gradually subsides. says he was bewildered at seeing the Buddha ill; the Buddha says he has taught the Dhamma in full without holding anything back, that he is now old, “eighty years of age, kept going like an old cart held together by repairs”. He tells his disciples to be islands and refuges to themselves, to make the Dhamma their island and refuge, and to practise the .

Different Accounts

Age: the Pali canon of the Southern tradition has eighty; the Chinese Youxing jing and Bannihuan jing have “nearly eighty”, the Chinese Mūlasarvāstivāda Vinaya “approaching eighty”; the Chinese Fo bannihuan jing and Bannihuan jing later each record seventy-nine.

More differences between accounts (3)

The Chinese Bannihuan jing says the Buddha fell ill when he came with Ānanda to “Weisha village”, a different place from where he dismissed the disciples.

The later commentaries of the Southern tradition say this illness left the Buddha “unable to rise again for ten months”.

The means of holding on to life: the Pali canon of the Southern tradition says he sustained life by force of will; the Sanskrit Mahāparinirvāṇa Sūtra says the Buddha suppressed the pain by force of will and dwelt in a concentration that grasps at no sign, but this sentence was supplied by modern editors from the Tibetan and Chinese versions.

Dating

Year 45 after the Awakening, the Buddha aged seventy-nine to eighty, during the ; the canonical text states that it was within the retreat; known only to fall within these three months.

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

Recorded by four schools: the Pali canon of the Southern tradition, the Chinese Dīrgha Āgama, the Sanskrit Mahāparinirvāṇa Sūtra and the Chinese Fo bannihuan jing and Bannihuan jing. Attested across multiple schools.

Dating Evidence and Precision

Stated in the canonical text (the text itself gives the time); commentarial dating (the canonical texts give no date; later commentaries record it). Time precision: month only.

Sources

Back to Year 45 after the Awakening · The Buddha at 79 to 80

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。