《新唐书·本纪·卷一·高祖》
隋朝留守卫文升等辅助代王杨侑守卫京城大兴，高祖派使者去通告他们，他们不予答复。
隋留守卫文升等奉代王侑守京城，高祖遣使谕之，不报。
Wei Wensheng and others who guarded the Sui Imperial city of Daxing assisted Prince Dai Yang You to defend the city and Emperor Gao sent messengers to inform them of his intentions but they did not respond.