《水经注·卷六》
汾水往南又从两城中间流过，这两座城左右相对，坐落在汾水两边，世人称为侯莫干城，地名大概源出戎语，口头相传，因而造成音讹。
又南出二城间。其城角倚，翼枕汾流，世谓之侯莫干城。盖语出戎方，传呼失实也。
The Fenhe River flowed south between the two cities, which were on both sides of the river. People called them the Houmogao cities, which probably originated from a foreign language and became distorted due to oral tradition.