《北史·列传·卷二十七》
炀帝继位，道衡又转任番州，途径彦谦的住所，留连多日，最后洒泪而别。
炀帝嗣位，道衡转牧番州，路经彦谦所，留连数日，屑涕而别。
After Emperor Yang succeeded to the throne, Daoheng was transferred to Fan Prefecture. On the way, he visited Yanqian's residence, stayed for many days, and finally said goodbye with tears.