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Based on the sutras, the Vinaya and later commentaries
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Sudinna of Kalanda village goes forth

Attested across multiple schools

, the son of a wealthy family of Kalanda village near , goes forth as a monk; the Vinaya texts of every major school record this event. According to the Pali Vinaya, he resolved to go forth after hearing the Buddha teach; being an only son, he was at first refused by his parents, and only when he lay on the ground and refused to eat did they consent. After going forth and receiving , he practised simple austerities and lived in a village in the Vajjian country.

Different Accounts

The year of his going forth: the later commentaries of the Southern tradition say “the Blessed One's twelfth year”; the Chinese Shanjian lü says “twelve years after the Buddha's awakening”; the Chinese Mūlasarvāstivāda Vinaya says the affair took place in the thirteenth year; the other Vinayas give no year number.

More differences between accounts (3)

The manner of his going forth: the Pali Vinaya says he received the going forth and full ordination from the Buddha; the Chinese Mahīśāsaka Vinaya says the Buddha simply called “Come, ” and his hair fell away of itself and he became a monastic; the Mūlasarvāstivāda Vinaya says he first took the five precepts as a and only later went forth.

The name: the Mūlasarvāstivāda Vinaya has Suzhenna; the Chinese Mahāsāṃghika Vinaya has , but the father's name, the place and the story are the same.

The exchange on “no going forth without the parents' consent” is found only in the Pali Vinaya and the Mahīśāsaka Vinaya; the Chinese Sarvāstivāda Vinaya says that after going forth he kept the in , and the Mūlasarvāstivāda Vinaya says he left his relatives and went elsewhere.

Dating

Year 12 after the Awakening, the Buddha aged forty-six, after the rains retreat (after the Buddha's arrival at Vesālī); the year is given by the later commentaries, and only the year is known.

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

The episode of “Sudinna's going forth” is recorded by three schools, the Pali canon of the Southern tradition, the Chinese Dharmaguptaka Vinaya (Sifen lü) and the Chinese Mahīśāsaka Vinaya (Wufen lü). Attested across multiple schools. The exchange on “no ordination without the parents' consent” within it is recorded by two schools, the Pali canon of the Southern tradition and the Chinese Mahīśāsaka Vinaya (Wufen lü).

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 12 after the Awakening · The Buddha at 46

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。