《后汉书·列传·文苑列传上》
十二岁时，太守刘护听说了，召他去，叫 门下孝子 ，十分喜欢他，敬重他。
年十二，大守刘护闻而召之，署门下孝子，甚见爱敬。
When he was 12, the Prefect Liu Hu heard about him, summoned him, called him the Cordial and Filial Son of the lower gate, liked him very much, and respected him.