《资治通鉴·唐纪·唐纪三》
宇文歆劝谏，齐王不改，他将所有的情况上奏朝延，是忠臣，怎么能杀掉？ 
歆谏，王不悛，寻皆闻奏，乃忠臣也，岂可杀哉！ 
Yuwen Xin's remonstration failed to change king of Qi, he reported all the information to the imperial court, he was a loyal minister so how could he be killed?