Tradition credits the Sutta Pitaka's recitation at the First Council to Ananda, the Buddha's personal attendant for much of his later teaching career and, by the tradition's own account, the disciple who had heard the greatest number of his discourses firsthand and retained them with unusual accuracy. That attribution matters to how the collection presents itself: many suttas open with the formula "thus have I heard," framing each discourse as something transmitted through a named chain of hearing and memory rather than as an anonymous doctrinal statement, and Ananda's role as the collection's primary rememberer is built into that framing from the start.
Modern textual scholarship reads the Sutta Pitaka, like the rest of the Pali Canon, as a collection shaped over generations of oral transmission before being committed to writing in Sri Lanka around the first century BCE, with formulaic repetition, standardized numerical lists and other features of oral literature visible throughout the text, evidence of the memorization techniques that kept a body of this size intact across an extended period without writing. Comparative study against parallel discourse collections preserved independently in Chinese translation, from different early Buddhist schools, gives scholars a way to check the Pali material against other transmission lines, generally confirming close agreement in substance even where wording and organization differ.