《汉书·传·匈奴传下》
韩昌、张猛擅自行事，拿汉朝世代子孙的未来与匈奴赌咒立盟，使得单于能够用恶言恶语告诉上天，使汉朝蒙受羞辱，有损国威，绝不能这样做。
昌、猛擅以汉国世世子孙与夷狄诅盟，令单于得以恶言上告于天，羞国家，伤威重，不可得行。
Han Chang and Zhang Meng acted on their own, betting the future of the Han Dynasty's descendants and the Xiongnu on a curse, so that the Chanyu could use harsh words to tell heaven, causing the Han Dynasty to be humiliated and damaging its national prestige. This absolutely cannot be done.