《资治通鉴·唐纪·唐纪二十八》
任命宇文融充任朝廷使者，负责搜求逃亡流失的户口及清查隐瞒不服的田地，查出的弄虚作假现象非常多。
以宇文融充使，括逃移户口及籍外田，所获巧伪甚众。
Yuwen Rong was appointed as the imperial envoy, responsible for searching for escaped and lost households and investigating concealed and disobedient fields. Many cases of fraud were found.