The Kāśyapīyas are believed to have become an independent school ca. 190 BCE. According to the Theravadin Mahāvaṃsa, the Kāśyapīya were an offshoot of the Sarvāstivāda. However, according to the Mahāsāṃghika account, the Kāśyapīya sect descended from the Vibhajyavādins.
In the 7th century CE, Yijing grouped the Mahīśāsaka, Dharmaguptaka, and Kāśyapīya together as sub-sects of the Sarvāstivāda, and stated that these three groups were not prevalent in the "five parts of India," but were located in the some parts of Oḍḍiyāna, Khotan, and Kucha.
Between 148 and 170 CE, the Parthian monk An Shigao came to China and translated a work which describes the color of monastic robes (Skt. kāṣāya) utitized in five major Indian Buddhist sects, called Da Biqiu Sanqian Weiyi (Ch. 大比丘三千威儀). Another text translated at a later date, the Śāriputraparipṛcchā, contains a very similar passage corroborating this information. In both sources, members of the Kāśyapīya sect are described as wearing magnolia robes. The relevant portion of the Mahāsāṃghika Śāriputraparipṛcchā reads, "The Kāśyapīya school are diligent and energetic in guarding sentient beings. They wear magnolia robes."
In Vasumitra's history Samayabhedoparacanacakra, the Haimavatas (Kāśyapīya sect) are described as an eclectic school upholding doctrines of both the Sthaviras and the Mahāsāṃghikas.
According to A.K. Warder, the Kāśyapīya school held the doctrine that arhats were fallible and imperfect, similar to the view of the Sarvāstivādins and the various Mahāsāṃghika sects. They held that arhats have not fully eliminated desires, that their "perfection" is incomplete, and that it is possible for them to relapse.
An incomplete translation of the Saṃyukta Āgama (T. 100) that is in the Chinese Buddhist canon is believed to be that of the Kāśyapīya sect. This text is different from the complete version of the Saṃyukta Āgama (T. 99), which came from the Sarvāstivāda sect.
- Warder, A.K. Indian Buddhism. 2000. p. 277
- Warder (1970/2004), p. 277.
- See, e.g., Mahāvaṃsa (trans., Geiger, 1912), ch. 5, "The Third Council," retrieved 27 Nov 2008 from "Lakdiva" at http://lakdiva.org/mahavamsa/chap005.html.
- Baruah, Bibhuti. Buddhist Sects and Sectarianism. 2008. p. 51
- Baruah, Bibhuti. Buddhist Sects and Sectarianism. 2008. p. 52
- Yijing. Li Rongxi (translator). Buddhist Monastic Traditions of Southern Asia. 2000. p. 19
- Hino, Shoun. Three Mountains and Seven Rivers. 2004. p. 55
- Hino, Shoun. Three Mountains and Seven Rivers. 2004. pp. 55–56
- Bhikku Sujato. Sects & Sectarianism: The Origins of Buddhist Schools. Santi Forest Monastery, 2006. p. i
- Baruah, Bibhuti. Buddhist Sects and Sectarianism. 2008. p. 54
- Malalasekera (2003), p. 556, entry for "Kassapiyā, Kassapikā" (retrieved 27 Nov 2008 from "Google Books" at https://books.google.com/books?id=LEn9i9pnRHEC&pg=PA556&lpg=PA556&dq=Kassapiya&source=bl&ots=5Yok7NZCEu&sig=963iBUcouWirVo7UT4zgpWigqJc&hl=en&sa=X&oi=book_result&resnum=1&ct=result#PPA556,M1).
- See, e.g., Brough (2001), pp. 44–45:
- ... We can with reasonable confidence say that the Gāndhārī text did not belong to the schools responsible for the Pali Dhammapada, the Udānavarga, and the Mahāvastu; and unless we are prepared to dispute the attribution of any of these, this excludes the Sarvāstivādins and the Lokottaravāda-Mahāsānghikas, as well as the Theravādins (and probably, in company with the last, the Mahīśāsakas). Among possible claimants, the Dharmaguptakas and Kāśyapīyas must be considered as eligible, but still other possibilities cannot be ruled out.
- Warder, A.K. Indian Buddhism. 2000. p. 6
- Brough, John (2001). The Gāndhārī Dharmapada. Delhi: Motilal Banarsidass Publishers Private Limited.
- Geiger, Wilhelm (trans.), assisted by Mabel H. Bode (1912). The Great Chronicle of Ceylon. Pali Text Society. ISBN 0-86013-001-0. Retrieved 27 Nov 2008 from "Lakdiva" at http://lakdiva.org/mahavamsa/.
- Malalasekera, G.P. (2003). Dictionary of Pali Proper Names. Asian Educational Services. ISBN 81-206-1823-8.
- Warder, A.K. (1970/2004). Indian Buddhism. Delhi: Motilal Banarsidass. ISBN 81-208-1741-9.