《资治通鉴·唐纪·唐纪五十四》
过了一天，果然有诏书送来，命令刘济 专力防护北部疆境，不要让朕再为胡人担忧，因而得以一心一意地对付王承宗。 
后一日，诏果来，令济 专护北疆，勿使朕复挂胡忧，而得专心于承宗。 
After one day, indeed an imperial edict was delivered, ordering Liu Ji to focus on protecting the northern border, ordering him not to let me worry about the northern peoples again, so that I could concentrate my efforts on suppressing Wang Chengzong. 