On Yuan Chwang's Travels in India, 629–645 A.D. v2.c21.s7.5

v2.c21.s7.5

With reference to the Brethren who abstained from the use of milk, curds, and as articles of food our pilgrim's statement that they did so as followers of Devadatta may have been the suggestion of a Mahāyānist Brother. All Mahāyānists were supposed to abstain from milk food, and I-ching states expressly that it is unlawful food.²