《资治通鉴·隋纪·隋纪五》
乙支文德又派使者来诈降，向宇文述请求说： 假若隋军能退兵，就一定让高元去朝见皇帝所在之地。 
文德复遣使诈降，请于述曰： 若旋师者，当奉高元朝行在所。 
Yuchi Wende again sent an envoy to pretend to surrender and asked Yuwenshu, "If the Sui army can withdraw, Gao Yuan will definitely go to the place where the emperor is to pay homage."