《资治通鉴·唐纪·唐纪一》
司马德戡让许弘仁、张恺去备身府，对认识的人说： 陛下听说骁果想反叛，酿了很多毒酒，准备利用宴会，把骁果都毒死，只和南方人留在江都。 
德戡使许弘仁、张恺入备身府，告所识者云： 陛下闻骁果欲叛，多醖毒酒，欲因享会，尽鸩杀之，独与南人留此。 
Sima Dekan had Xu Hongren and Zhang Kai go to the imperial palace and tell acquaintances: "His Majesty heard that the palace guards intended to rebel, and so brewed many barrels of poisoned wine, preparing to poison all the guards at a banquet, and remain only with southerners in Jiangdu."