《新唐书·列传·卷四》
宇文歆多次劝谏，完全不听。宇文歆便上表于高祖说： 齐王多次出城与窦诞肆意游猎，蹂践民田，放纵左右公然劫夺，民间六畜殆尽。
歆骤谏，不纳，乃显表於帝曰： 王数出与窦诞纵猎，蹂民田，纵左右攘夺，畜产为尽。
Yuwen Xin repeatedly advised him, but he did not listen at all. So Yuwen Xin memorialised to Gaozu, saying: Prince Qi has repeatedly gone out of the city with Dou Dan to hunt, trampled on the fields of the people, and allowed his subordinates to openly rob the people, so that the livestock of the people are almost exhausted.