《宋史·列传·卷九十三》
徐禧上奏： 李士宁赠给康的诗确实是仁宗御制诗，现在狱官认为李士宁谋反，我不敢苟同。 范百禄说： 李士宁有可死的罪状，徐禧故意开脱他以献媚大臣。 朝廷以御史杂知、枢密承旨参加处理，而范百禄因上报不实贬官，提升徐禧为集贤校理、检正礼房。
禧奏： 士宁遗康诗实仁宗制，今狱官以为反，臣不敢同。 百禄言： 士宁有可死之状，禧故出之以媚大臣。 朝廷以御史杂知、枢密承旨参治，而百禄坐报上不实贬，进禧集贤校理、检正礼房。
Xu Xi memorialized: The poem that Li Shi'ning gave to Kang was indeed written by Emperor Renzong. Now the prison officials believe that Li Shi'ning was plotting rebellion, but I cannot agree with this. Fan Bailu said: Li Shi'ning deserves to die. Xu Xi is deliberately trying to exonerate him in order to curry favor with the ministers. The court ordered the Censor for Miscellaneous Affairs and the Deputy Secretary to the Council of State to participate in the investigation, and demoted Fan Bailu for reporting false information, while promoting Xu Xi to Proofreader of the Collection of Worthies and Inspector of the Bureau of Rites.