The concept of buddhavacana (word of the Buddha) is important in understanding how Buddhists classify and see their texts. Buddhavacana texts have special status as sacred scripture and are generally seen as in accord with the teachings of the historical Buddha, which is termed "the Dharma". According to Donald Lopez, the criteria for determining what should be considered buddhavacana were developed at an early stage, and that the early formulations do not suggest that Dharma is limited to what was spoken by the historical Buddha.[8]
The Mahāsāṃghika and the Mūlasarvāstivāda considered both the Buddha's discourses and those of his disciples to be buddhavacana.[8] A number of different beings such as Buddhas, disciples of the Buddha, ṛṣis, and devas were considered capable to transmitting buddhavacana.[8] The content of such a discourse was then to be collated with the sūtras, compared with the Vinaya, and evaluated against the nature of the Dharma.[9][10] These texts may then be certified as true buddhavacana by a buddha, a sangha, a small group of elders, or one knowledgeable elder.[9][10]
In Theravāda Buddhism, the standard collection of buddhavacana is the Pāli Canon, also known as the Tripiṭaka ("three baskets"). Generally speaking, the Theravāda school rejects the Mahāyāna sūtras as buddhavacana (word of the Buddha), and do not study or see these texts as reliable sources.[11] In East Asian Buddhism, what is considered buddhavacana is collected in the Chinese Buddhist canon; the most common edition of this is the Taishō Tripiṭaka, itself based on the Tripiṭaka Koreana. This collection, unlike the Pāli Tripiṭaka, contains Mahāyāna sūtras, Śāstras (scholastic treatises), and Esoteric Buddhist literature.
According to Venerable Hsuan Hua from the tradition of Chinese Buddhism, there are five types of beings who may speak the sutras of Buddhism: a Buddha, a disciple of a Buddha, a deva, a ṛṣi, or an emanation of one of these beings; however, they must first receive certification from a buddha that its contents are true Dharma.[12] Then these sutras may be properly regarded as buddhavacana.[12] Sometimes texts that are considered commentaries by some are regarded by others as buddhavacana.[13]
In Indo-Tibetan Buddhism, what is considered buddhavacana is collected in the Kangyur ('The Translation of the Word'). The East Asian and Tibetan Buddhist Canons always combined buddhavacana with other literature in their standard collected editions. However, the general view of what is and is not buddhavacana is broadly similar between East Asian Buddhism and Tibetan Buddhism. The Tibetan Kangyur, which belongs to the various schools of Tibetan Vajrayāna Buddhism, in addition to containing sutras and Vinaya, also contains Buddhist tantras and other related Tantric literature.
