Abhidhamma Pitaka
The Pāli Canon, which consists of the Theravada texts of reference and considered to be directly transmitted from the Buddha, was formalized at that time. It is known as the "Tipiṭaka" or "Three Baskets" and contains doctrine (Sutta Pitaka), monastic discipline (Vinaya Pitaka) and a compendium of philosophy (the Abhidhamma Pitaka).