"Although there is no evidence for writing before Aśoka, the accuracy of oral transmission should not be underestimated. The Buddhist community was full of Brahmins who knew that the Vedic educational system had transmitted a mass of difficult texts, verbatim, in an increasingly archaic language, for more than a thousand years. Since the early Buddhists required a different means of oral transmission, for quite different texts, other mnemonic techniques were developed, based on communal chanting (saṅgīti). The texts explicitly state that this method was to be employed, and their actual form shows that it was, on a grand scale." - Wynne, Alexander. Did the Buddha exist? JOCBS. 2019(16): 98–148.