《资治通鉴·隋纪·隋纪八》
使者七天后返回，见信，李渊的将领僚佐们都很高兴，请李渊听从突厥人的话，李渊认为不可。
使者七日而返，将佐皆喜，请从突厥之言，渊不可。
The messenger returned seven days later, and after reading the letter, Li Yuan's generals and staff were very happy and asked Li Yuan to listen to the Turks. However, Li Yuan thought it was impossible.