《资治通鉴·唐纪·唐纪七十七》
李克用再三催促，派出的使者接二连三地到达幽州，可是几个月过去，刘仁恭的军队还是不出发。
克用屡趣之，使者相继，数月，兵不出。
Li Keyong repeatedly sent messengers to urge him, but even after several months, Liu Rengong's troops still had not departed.