大方便佛報恩經 3.15

3.15

爾時六師作是念：「復何因緣，有此寶塔？若有人來問我者，而我不知。若不知者，云何復名一切知見？」復作是念：「瞿曇何不速為大眾敷演斯事？」

At that time, the six teachers considered: "By what cause and condition is there this jeweled stūpa? If someone comes to ask me, I will not know. If I do not know, how can I still be called one of all knowledge and vision?" They further thought: "Why does Gautama not quickly expound this matter for the great assembly?"