大唐西域記 7.16

7.16

捩牙側不遠有窣堵波，是如來修菩薩行時，愍世無禮，示為鳥身，與彼獼猴、白象，於此相問，誰先見是尼拘律樹，各言事迹，遂編長幼，化漸遠近，人知上下，道俗歸依。

By the side of this spot, and not far from it, is a stupa. It was here Bodhisattva, in his preparatory career, grieved to see that there was little politeness (reverence) amongst men, took the form of a bird, and joining himself to the company of a monkey and a white elephant, he asked them in this place, "Which of you saw first this Nyagrodha (Ni-ku-liu) tree?" Each having answered according to circumstances, he placed them according to their age. The good effects of this conduct spread itself little by little on every side; men were able to distinguish the high from the low, and the religious and lay people followed their example.