《新唐书·列传·卷一百四十二》
现在的可汗初立，派使者来，披散头发自作罪人，待天子发落。
今可汗初立，遣使来告，垂发不翦，待天子命。
The current khagan has just taken power, and he sent messengers here with disheveled hair, presenting himself as a guilty person, awaiting the emperor's judgment.