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Based on the sutras, the Vinaya and later commentaries
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Members of other sects must serve a probation before going forth

Attested across multiple schools

The Buddha rules that those who formerly belonged to other sects and wish to go forth must first serve a period of probation before receiving full ordination. The Pali canon of the Southern tradition says volunteered to serve a probation of four years.

Different Accounts

The probation period: the Pali canon of the Southern tradition, the Chinese Youxing jing and Mūlasarvāstivāda Vinaya and the Mahāparinirvāṇa Sūtra translated by Faxian have four months; the Chinese Fo bannihuan jing and Bannihuan jing have three months.

More differences between accounts (1)

The Tibetan Vinaya says that Sakyans and fire-worshipping, long-haired ascetics need not serve the probation.

Dating

Year 45 after the Awakening, the Buddha aged seventy-nine to eighty, after the , on the night of the passing; stated in the canonical text; it can be fixed to this night.

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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 Dīrgha Āgama, the Chinese Kṣudrakavastu of the Mūlasarvāstivāda Vinaya, the Chinese Fo bannihuan jing and Bannihuan jing and the Chinese three-fascicle Mahāparinirvāṇa Sūtra. Attested across multiple schools.

Dating Evidence and Precision

Stated in the canonical text (the text itself gives the time). Time precision: fixed to the day.

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。