《资治通鉴·唐纪·唐纪四十一》
夏季，四月甲申，郭子仪向代宗辞行回州时，又向代宗谈到边疆大事，以至涕泪俱下。
夏，四月，甲申，郭子仪辞还邠州，复为上言边事，至涕泗交流。
In the summer, on Jiashin in April, when Guo Ziyi bid farewell to Emperor Daizong before returning to his state, he again spoke about important issues concerning the border regions with Emperor Daizong, to the point of shedding tears.