《汉书·传·王贡两龚鲍传》
汉元帝即位不久，征召贡禹为谏大夫，多次屈尊向他询问政事。
元帝初即位，征禹为谏大夫，数虚己问以政事。
Not long after Emperor Han Yuan came to the throne, he drafted Gong Yu as remonstrance grandee and humbly asked him for advice on state affairs several times.