Sutra on the Threefold Training
The Sūtra on the Threefold Training (Skt. Śikṣātrayasūtra; Tib. བསླབ་པ་གསུམ་གྱི་མདོ།; Wyl. bslab pa gsum gyi mdo) is a brief introduction, one by one in a progressive order, to three elements of the path known as the ‘three trainings’ namely that of discipline, meditative concentration, and wisdom. The Buddha teaches that training in them progressively constitutes the gradual path to awakening.
Dergé Kangyur, vol. 68 (mdo sde, ya), folios 55.b–56.a.