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Based on the sutras, the Vinaya and later commentaries
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Sudinna returns home and has intercourse with his former wife

Attested across multiple schools

After his going forth lives in a village in the Vajjian country (an ancient country north of the Ganges); when famine strikes, he returns to his home village of Kalanda near for alms. A maidservant of the household recognizes him, and his parents urge him to return to lay life, which he refuses; his mother, worried that there will be no heir to the family property, asks him to leave the family a descendant, and so Sudinna has intercourse with his former wife, who later bears a son. The Vinaya texts of every major school record this event.

Different Accounts

Year: the later commentaries of the Southern tradition say Sudinna went forth in “the Blessed One's twelfth year” and returned home for alms in “the twentieth year”, having then been gone forth eight years; the Chinese Shanjian lü says much the same, but if one calculates by its “went forth after twelve years” and “trained for eight years”, it falls around Year 21; the Chinese Mūlasarvāstivāda Vinaya says the thirteenth year; the Chinese Mahāsāṃghika Vinaya says the Buddha laid down the rule over this event in the winter of Year 5 after the Awakening.

More differences between accounts (3)

The Pali Vinaya says his son was named “Seed”, and that mother and son both later went forth and attained .

Name: the Mahāsāṃghika Vinaya has ; the Mūlasarvāstivāda Vinaya has Suzhenna.

The Chinese Sarvāstivāda Vinaya says Sudinna kept the in , and returned to Vesālī only after the retreat ended and the robes had been made.

Dating

Year 20 after the Awakening, the Buddha aged fifty-four, whether before or during the rains retreat is unclear; the year is given by the later commentaries (the eighth year after Sudinna's going forth), and only the year is known.

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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 Sarvāstivāda Vinaya (Shisong lü) and the Chinese Mahāsāṃghika Vinaya. 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: year only.

Sources

Back to Year 20 after the Awakening · The Buddha at 54

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。