大比丘三千威儀 1.23

1.23

九十事皆應懺，若犯過一日即悔，應作三日懺。過三日不悔，應作七日懺。過七日不悔，應作十五日懺。過十五日不悔，應作三十日懺。過三十日不悔，應作九十日懺。若懺，當滿四人。

The ninety matters [of śuddha-pāyattika] must all be repented. If one repents immediately after one day has passed since 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 should perform a ninety-day repentance. If one repents, there must be a full assembly of four persons.