《隋书·列传·卷四十九》
后来，契丹出伏等部落背叛高丽，带领部落成员归附隋朝，高祖接收了他们，安置他们在渴奚那颉的北面居住。
其后契丹别部出伏等背高丽，率众内附。高祖纳之，安置于渴奚那颉之北。
Later, the Qidan, Chufuji and other tribes betrayed Goryeo, led their tribe members to surrender to the Sui Dynasty, and Gaozu accepted them, settling them in the north of Kehuxi Naqie.