《宋史·本纪·卷二十四》
朝廷内外官员及百姓都可以上书陈述民间疾苦，即使冒犯朝廷和皇帝也不问罪。
中外臣庶许言民间疾苦，虽诋讦亦不加罪。
The officials and common people both inside and outside the court could submit a petition to state the hardships of the people, even if it offended the court and the emperor, they would not be punished.