法華文句記 1.24

1.24

「律開五部」者，佛滅度後一百年間毱多持法，所化眾生不相是非，但為一部不毘尼藏，即八十誦。一百年後毱多有五弟子，各執一見不能均融齊一，遂分一藏以為五異，如析金杖不失金用。今分文亦爾，雖分為多段，知大旨本一，以所分對本，故云及也。

Regarding 'the vinaya was divided into five divisions', during the one hundred years after the Buddha's parinirvāṇa, Upagupta upheld the Dharma, and the sentient beings he transformed did not argue right and wrong, but possessed only a single division of the Vinaya Piṭaka, namely the Eighty Recitations. One hundred years later, Upagupta had five disciples, each holding to a single view and unable to harmonize as one; thereupon they divided the single piṭaka into five differences, like breaking a gold staff without losing the use of gold. Dividing the text now is also like this: although it is divided into many sections, one knows that the great purport was originally one; contrasting what is divided with the origin, it says 'and so forth.'