《新唐书·列传·卷一百四十九》
仆固怀恩父子才新立功，攻取河朔就像拾起掉在地上的东西那样轻易，其名声高出各将领甚多，而竟然遭到辛云京的拒绝，大怒，上表诉说辛云京的情况，屯军汾州，派裨将李光逸带兵守祁州，李怀光守晋州，张如岳守沁州，高晖等十多人跟随自己，当时监军骆奉先从辛云京处回来，辛云京已经和他结欢，于是对他说仆固怀恩与回纥可汗相约欲反的情况已很明显。
怀恩既父子新立功，举河朔若拾遗，名出诸将远甚，而为云京所拒，大怒，表上其状。顿军汾州，使裨将李光逸以兵守祁，李怀光据晋州，张如岳据沁州，高晖等十余人自从。会监军骆奉先自云京所归，云京已厚结其欢，因言怀恩与可汗约反状明白。
Pugu Huaien and his son had just made a great contribution - taking Hebei was as easy as picking up something from the ground. Their reputation was much higher than that of the other generals. Yet, they were rejected by Xin Yunqing, so they were furious. They submitted a memorial to the emperor to complain about Xin Yunqing. They stationed their troops in Fen Zhou, and sent their subordinate general Li Guangyi to lead troops to guard Qi Zhou, Li Huaiguang to guard Jin Zhou, and Zhang Ruyue to guard Qin Zhou. More than ten people, including Gao Hui, followed them. At that time, the supervisor Luo Fengxian came back from Xin Yunqing, and he had made friends with Xin already. So he told Huaien that Pugu Huaien was obviously conspiring with the Huihe Khan to rebel.