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Based on the sutras, the Vinaya and later commentaries
About the Sources

The Buddha first lays down the rains retreat

Attested across multiple schools

At that time there was no rule of , and the monks wandered in all seasons; in the rainy season too they trampled the young grass and harmed small creatures, and people criticized them: even the practitioners of other sects settle down for the rains, and even the birds build nests and stay. The monks reported this to the Buddha, and the Buddha allowed the monks to enter the rains retreat in the rainy season. The later commentary on the Aṅguttara Nikāya of the Southern tradition says that for the first twenty years after the Awakening the Buddha had not laid down the rains retreat, and monastics wandered as they pleased in the rainy and dry seasons alike.

Different Accounts

Place: the Pali Vinaya and the Chinese Sarvāstivāda Vinaya have the Bamboo Grove at ; the Chinese Dharmaguptaka, Mahīśāsaka and Mahāsāṃghika Vinayas have the at .

More differences between accounts (2)

The occasion: the Pali Vinaya says it was monks in general; the Chinese Dharmaguptaka Vinaya says it was the group of six monks (six monks who frequently broke the rules).

The later commentaries say the rains retreat was not laid down in the first twenty years, yet other records list the place of the rains retreat for each of the first twenty years; the two records stand side by side and are kept as they are.

Dating

Known only to fall between Year 20 and Year 21 after the Awakening (the Buddha aged fifty-four to fifty-five). This is derived from the later commentaries' statement that “the rains retreat was not laid down in the first twenty years”; the Vinayas of the various schools themselves give no year.

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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

Commentarial dating (the canonical texts give no date; later commentaries record it). Time precision: year uncertain.

Sources

Back to Events known only to fall within a span of years

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。