Pali canon.

The earliest surviving collection of Buddhist scriptures, the Pali canon consists of the Vinaya (monastic discipline), Sutta (discourses), and Abhidhamma (systematic teachings). The Pali canon purports to preserve an oral lineage of early Buddhist teachings and was first written down in Sri Lanka around the turn of the common era. It remains the authoritative textual foundation of Theravada Buddhist doctrine and practice.