大方便佛報恩經 4.5

4.5

Then Ānanda, observing that in the minds of the assembly there was universal doubt, immediately rose from his seat, bared his right shoulder, placed his right knee upon the ground, knelt reverently with joined palms, and said to the Buddha: "Bhagavat! How was it that in past lives Devadatta harmed the Bhagavat?"