《新唐书·列传·卷一百四十五》
福信专掌国事兵权，欲杀扶余丰。丰率亲信斩杀福信，与高丽、倭国联和。
福信颛国，谋杀丰；丰率亲信斩福信，与高丽、倭连和。
Fuxin was in charge of national affairs and military power, wanted to kill Fuyu Feng. Feng led his confidants to kill Fuxin, and allied with Goryeo and Japan.