《后汉书·列传·儒林列传上》
济阴曹曾字伯山，跟欧阳歙学《尚书》，门生三千人，位至谏议大夫。
济阴曹曾字伯山，从歙受《尚书》，门徒三千人，位至谏议大夫。
Jiyin Cao Zeng, styled Bo Shan, studied the Book of History with Ouyang Xi, and had 3,000 disciples, he rose to the rank of councillor.