相応部（サンユッタ・ニカーヤ） 2:6
SUJATOEte kho, bhikkhave, ubho ante anupagamma majjhimā paṭipadā tathāgatena abhisambuddhā cakkhukaraṇī ñāṇakaraṇī upasamāya abhiññāya sambodhāya nibbānāya saṁvattati.
Avoiding these two extremes, the Realized One understood the middle way of practice, which gives vision and knowledge, and leads to peace, direct knowledge, awakening, and extinguishment.