The Buddha
First sermon and formation of the saṅgha

According to MN 26, immediately after his awakening, the Buddha hesitated on whether or not he should teach the Dharma to others. He was concerned that humans were overpowered by ignorance, greed, and hatred that it would be difficult for them to recognise the path, which is "subtle, deep and hard to grasp". However, the god Brahmā Sahampati convinced him, arguing that at least some "with little dust in their eyes" will understand it. The Buddha relented and agreed to teach. According to Anālayo, the Chinese parallel to MN 26, MĀ 204, does not contain this story, but this event does appear in other parallel texts, such as in an Ekottarika-āgama discourse, in the Catusparisat-sūtra, and in the Lalitavistara.

According to MN 26 and MĀ 204, after deciding to teach, the Buddha initially intended to visit his former teachers, Alara Kalama and Udaka Ramaputta, to teach them his insights, but they had already died, so he decided to visit his five former companions. MN 26 and MĀ 204 both report that on his way to Vārānasī (Benares), he met another wanderer, an Ājīvika ascetic named Upaka in MN 26. The Buddha proclaimed that he had achieved full awakening, but Upaka was not convinced and "took a different path".

MN 26 and MĀ 204 continue with the Buddha reaching the Deer Park (Sarnath) (Mrigadāva, also called Rishipatana, "site where the ashes of the ascetics fell") near Vārānasī, where he met the group of five ascetics and was able to convince them that he had indeed reached full awakening. According to MĀ 204 (but not MN 26), as well as the Theravāda Vinaya, an Ekottarika-āgama text, the Dharmaguptaka Vinaya, the Mahīśāsaka Vinaya, and the Mahāvastu, the Buddha then taught them the "first sermon", also known as the "Benares sermon", i.e. the teaching of "the noble eightfold path as the middle path aloof from the two extremes of sensual indulgence and self-mortification". The Pali text reports that after the first sermon, the ascetic Koṇḍañña (Kaundinya) became the first arahant (liberated being) and the first Buddhist bhikkhu or monastic. The Buddha then continued to teach the other ascetics and they formed the first saṅgha, the company of Buddhist monks.

Various sources such as the Mahāvastu, the Mahākhandhaka of the Theravāda Vinaya and the Catusparisat-sūtra also mention that the Buddha taught them his second discourse, about the characteristic of "not-self" (Anātmalakṣaṇa Sūtra), at this time or five days later. After hearing this second sermon the four remaining ascetics also reached the status of arahant.

The Theravāda Vinaya and the Catusparisat-sūtra also speak of the conversion of Yasa, a local guild master, and his friends and family, who were some of the first laypersons to be converted and to enter the Buddhist community. The conversion of three brothers named Kassapa followed, who brought with them five hundred converts who had previously been "matted hair ascetics", and whose spiritual practice was related to fire sacrifices. According to the Theravāda Vinaya, the Buddha then stopped at the Gayasisa hill near Gaya and delivered his third discourse, the Ādittapariyāya Sutta (The Discourse on Fire), in which he taught that everything in the world is inflamed by passions and only those who follow the Eightfold path can be liberated.

At the end of the rainy season, when the Buddha's community had grown to around sixty awakened monks, he instructed them to wander on their own, teach and ordain people into the community, for the "welfare and benefit" of the world.
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