《资治通鉴·汉纪·汉纪十五》
汉使来到匈奴，要求放苏武等人回国，匈奴假称苏武已死。
汉使至，求苏武等，匈奴诡言武死。
The Han envoy came to the Xiongnu and requested for the release of Su Wu and others to return to their homeland. The Xiongnu falsely claimed that Su Wu had already died.