《旧唐书·本纪·卷三》
二十八日，皇上诏令，由于梁朝皇侃、褚仲都，周朝熊安生、沈重，陈朝沈文阿、周弘正、张讥，隋朝何妥、刘焯、刘炫等前代著名儒家，学生徒众大多按他们的儒家道义行事，命人寻访他们的后人。
乙未，诏以梁皇侃、褚仲都，周熊安生、沈重，陈沈文阿、周弘正、张机，隋何妥、刘焯、刘炫等前代名儒，学徒多行其义，命求其后。
On the twenty-eight day, the emperor issued a decree to search for the descendants of the famous Confucian scholars of the past dynasties, such as Liang Dynasty’s Huang Kan and Chu Zhongdu, Zhou Dynasty’s Xiong Ansheng and Shen Zhong, Chen Dynasty’s Shen Wen’an, Zhou Hongzheng, and Zhang Ji, and Sui Dynasty’s He Tuo, Liu Zhao, Liu Xuan, because most of their students and followers behaved according to Confucian morality.