《后汉书·列传·杨李翟应霍爰徐列传》
碰上杨终因事系狱，博士赵博、校书郎班固、贾逵等，认为杨终对《春秋》很有研究，学术上多独特见解，上表请求，杨终又上书自我表白，即日赦免，于是得以参与白虎观。
会终坐事系狱，博士赵博、校书郎班固、贾逵等，以终深晓《春秋》，学多异闻，表请之，终又上书自讼，即日贳出，乃得与于白虎观焉。
Yang Zhong happened to be imprisoned at the time, and Zhao Bo the assistant professor, Ban Gu and Jia Kui, the Library Attendants, thought Yang Zhong researched the Spring and Autumn Annals, and had unique theories from an academic perspective, and made a request in a memorial. Yang Zhong also wrote a letter to express his views, and he was pardoned that day, and consequently, he was able to participate in the White Tiger Temple.