大唐西域記 9.33

9.33

於是迦葉揚言曰：「念哉諦聽！阿難聞持，如來稱讚，集素呾纜（舊曰修多羅，訛也）藏。優波釐持律明究，眾所知識，集毘奈耶（舊曰毘那耶，訛也）藏。我迦葉波集阿毘達磨藏。」兩三月盡，集三藏訖。以大迦葉僧中上座，因而謂之上座部焉。

Ananda, with words of submission, retired and came to a desert place, desiring to reach a condition "beyond learning;" he strove for this without intermission, but with no result. At length, wearied out, he desired one day to lie down. Scarcely had his head reached the pillow when lo! he obtained the condition of an Arhat. He then went to the assembly, and knocking at the door, announced his arrival. Kâśyapa then asked him, saying, "Have you got rid of all ties? In that case exercise your spiritual power and enter without the door being opened!" Ananda, in compliance with the order, entered through the keyhole, and having paid reverence to the priesthood, retired and sat down. At this time fifteen days of the summer rest (Varshavasana) had elapsed. On this Kasyapa rising, said, "Consider well and listen! Let Ananda, who ever heard the words of Tathagata, collect by singing through the Sutra-pitaka. Let Upali (Yeu-po-li), who clearly understands the rules of discipline (Vinaya), and is well known to all who know, collect the Vinaya-pitaka; and I, Kasyapa, will collect the Abhidharma-pitaka." The three months of rain being past, the collection of the Tripitaka was finished. As the great Kasyapa was the president (Sthavira) among the priests, it is called the Sthavira (Chang-tso-pu) convocation.