《资治通鉴·唐纪·唐纪六》
突厥恨弘农公刘世让成为他们的威胁，派大臣曹般来唐，说刘世让和突厥可汗交通密谋，准备叛乱，高祖相信了这些话。
突厥恶弘农公刘世让为己患，遣其臣曹般陁来，言世让与可汗通谋，欲为乱，上信之。
The Turks hated Hongnong Duke Liu Shi让 for being a threat to them, and sent their minister Cao Ban to Tang to say that Liu Shi让 had colluded with the Turkic Khan and plotted a rebellion, Gaozu believed this talk.