《资治通鉴·汉纪·汉纪三十四》
刘秀不忍心，又派来歙到县送亲笔信给隗嚣，说： 从前，高祖的大将柴武说： 陛下宽厚仁爱，诸侯中虽有逃亡反叛的，以后归顺，就恢复爵位封号，不予诛杀。 
帝不忍，复使来歙至汧，赐嚣书曰： 昔柴将军云：陛下宽仁，诸侯虽有亡叛而后归，辄复位号，不诛也。 
Liu Xiu was reluctant to do this, and sent Lai Xi to the county to deliver a personal letter to Kui Xiao, which stated: “In the past, Gao Zu's great general Chai Wu said: 'His Majesty is generous and benevolent. Even though the vassals rebelled and fled, if they later return and submit, their titles and fiefs will be restored, and they will not be executed.'