About Thus have I heard

Thus have I heard is the common translation of the first line of the standard introduction of Buddhist discourses. This phrase serves to confirm that the discourse is coming from the Buddha himself, as a "seal of authenticity". Buddhist tradition maintains that the disciple Ānanda used the formula for the first time, as a form of personal testimony, but this is disputed by some scholars. It is also disputed how the phrase relates to the words that follow, and several theories have been developed with regard to how the text was originally intended to be read. The formula has also been used in later Mahāyāna and Vajrayāna discourses.