《资治通鉴·唐纪·唐纪七十一》
第三天早晨，高厚对投降的人说： 开始时本想立即放你们回家，可是前面道上各个寨子的百姓还不知道我的心思，有的人会有忧虑和疑问，现在借助你们在前面行走，经过穿口、新津寨一带时，向那里的百姓展示你们北上的 归顺 二字，把投降情告诉他们，等到了延贡，就放你们回去。 
明旦，仁厚谓降者曰： 始欲即遣汝归，而前涂诸寨百姓未知吾心，或有忧疑，藉汝曹为我前行，过穿口、新津寨下，示以背字告谕之，比至延贡，可归矣。 
On the morning of the third day, Gao Hou said to the surrendered people: "At first, I wanted to let you go home immediately, but the people in the villages on the road ahead still don't know what I mean, and some will have worries and questions. Now, with your help in the front, you can go through the Wear mouth, Xinjinzhai, you can show the people there the words "surrender" on your way north and tell them about the surrender, and when you get to Yanggong, let you go back.