大比丘三千威儀 1.22

1.22

三十事皆應懺，當滿七人比丘，少一人不應懺。若犯一日即悔，應作三日懺。若過三日不悔，應作七日懺。若過七日不悔，應作十五日懺。若過十五日不悔，應作三十日懺。若過三十日不悔者，當作九十日懺。

The thirty matters [of nihsargika-pāyattika] must all be repented; they require a full assembly of seven bhikṣus; if missing one person, one should not repent. If one repents on the very day of committing the fault, one should perform a three-day repentance. If one does not repent after three days have passed, one should perform a seven-day repentance. If one does not repent after seven days have passed, one should perform a fifteen-day repentance. If one does not repent after fifteen days have passed, one should perform a thirty-day repentance. If one does not repent after thirty days have passed, one must perform a ninety-day repentance.