As I stated previously, Ven. Yin Shun supports the Sarvastivada view.
For the discussion of this topic, I repeat here what I have stated:
In his work, The Formation of Early Buddhist Texts 原始佛教聖典之集成, Ven. Yin Shun suggests that there were two phases in Early Buddhism (Pre-sectarian Buddhism):
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‘Samyukta/Samyutta Buddhism’ based on saṃyukta-kathā 相應教 (had its origin in the first Saṅgha council, shortly after the death of the Buddha)
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‘Agama/Nikaya Buddhism’ based on the four principal Agamas/Nikayas (i.e. SA/SN, MA/MN, DA/DN, EA/AN) (originated at the second council, one hundred years after the death of the Buddha)
However, the extant Agamas/Nikayas are sectarian texts. One can seek an understanding of early Buddhist teachings by studying them comparatively.
The connection between SA/SN and the other three Agamas/Nikayas in historical context are:
• SA/SN has three-anga structure (sutra, geya, vyakarana angas), whose structure had its origin in the first council.
• These three angas formed in sequence. The sutra-anga was the earliest of the three.
• MA/MN was expanded mainly from vyakarana (弟子所說) of SA/SN.
• DA/DN was expanded mainly from geya (祇夜) of SA/SN.
• EA/AN was edited mainly for the promotion of Buddhist teachings for the general public.
• Saṃyukta-āgama/Saṃyutta-nikāya (SA/SN) was not at first being termed as āgama or nikāya, but generally named the ‘Connected Discourses’ 相應教 Saṃyukta-kathā.
• Calling the Saṃyukta/Saṃyutta as āgama/nikāya ‘collection’ was until when the other three āgamas/nikāyas (MA/MN, DA/DN, EA/AN) were gradually developed and expanded from it (相應教 Saṃyukta-kathā)
• MA/MN, DA/DN, and EA/AN originated at the second council.
• However, the extant four principal Agamas/Nikayas are sectarian texts. One can seek an understanding of early Budhist teachings by studying them comparatively.
The following is a quotation, in Chapter 10, Section 4, from the book The Formation of Early Buddhist Texts by Yin Shun:
第四節 結說
經上來的比對研究,「四阿含」(「四部」)的成立,可得到幾點明確的認識。1.佛法的結集,起初是「修多羅」,次為「祇夜」、「記說」——「弟子所說」、「如來所說」。這三部分,為組成「雜阿含」(起初應泛稱「相應教」)的組成部分。「弟子所說」與「如來所說」,是附編於「蘊」、「處」、「因緣」、「菩提分法」——四類以下的。這是第一結集階段。
在「雜阿含」三部分的集成過程中,集成以後,都可能因經文的傳出而編入,文句也逐漸長起來了。佛教界稟承佛法的宗本——「修多羅」,經 「弟子所說」的學風,而展開法義的分別、抉擇、闡發、論定,形成了好多經典。結集者結集起來,就是 「中阿含」;這是以僧伽、比丘為重的,對內的。
將分別抉擇的成果,對外道、婆羅門,而表揚佛是正等覺者,法是善說者,適應天、魔、梵——世俗的宗教意識,與「祇夜」精神相呼應的,集為「長阿含」。
「雜」、「中」、「長」,依文句的長短而得名。
以(弟子所說)「如來所說」為主,以增一法而進行類集,《如是語》與《本事經》的形成,成為「九分教」之一,還在「中」、「長」——二部成立以前。但為了便於誦持,著重於一般信眾的教化,廢去「傳說」及「重頌」的形式,而進行擴大的「增壹阿含」的編集,應該比「長阿含」更遲一些。
以「雜阿含」為本而次第形成四部阿含,《瑜伽師地論》的傳說,不失為正確的說明!近代的研究者,過分重視巴利文(Pāli);依巴利文聖典,不能發見四部阿含集成的真相。
即使以「雜阿含」的原形為最古,而不能理解為三部分(「修多羅」、「祇夜」、「記說」)的合成;不知三部分的特性,與三部阿含形成的關係,也就不能理解依「雜阿含」而次第形成四部的過程。
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Cf.: Choong Mun-keat:
The Fundamental Teachings of Early Buddhism: A Comparative Study Based on the Sūtrāṅga portion of the Pāli Saṃyutta-Nikāya and the Chinese Saṃyuktāgama (Series: Beitrage zur Indologie Band 32; Harrassowitz Verlag, Wiesbaden, 2000).
“Ācāriya Buddhaghosa and Master Yinshun 印順 on the Three-aṅga Structure of Early Buddhist Texts”, Research on the Saṃyukta-āgama (Dharma Drum Institute of Liberal Arts, Research Series 8; edited by Dhammadinnā), Taiwan: Dharma Drum Corporation, August 2020, pp. 883-932.
E.g.: pp. 7-11, notes 32, 34, 36 (on the nine angas), in Choong Mun-keat’s The Fundamental Teachings of Early Buddhism.
Early Buddhism resources (section/page 10), Dhamma Wheel site.