《旧唐书·列传·卷一百三十九》
唐代贞观年间，扬州长史李袭誉上表推荐曹宪，太宗征召为弘文馆学士，曹宪因年老而没上京就任。
贞观中，扬州长史李袭誉表荐之，太宗征为弘文馆学士。
During the Zhenguan period in the Tang Dynasty, Li Xiyu, a historian of Yangzhou, recommended Cao Xian to the court above. Tang Taizong summoned Cao Xian to be a scholar of the Hongwen Museum, but Cao Xian failed to take office in the capital because of his age.