《资治通鉴·陈纪·陈纪一》
六月，戊子，北周因为久雨不停，下诏让群臣献上密封的条陈尽力进谏。
六月，戊子，周以霖雨，诏群臣上封事极谏。
In June, on the day of Wushen (10th), the Northern Zhou court, because of the incessant heavy rain, issued an imperial edict asking all the ministers of the court to submit sealed suggestions and advice.