《汉书·传·司马相如传上》
用家资买了个郎官，奉事汉景帝，任武骑常侍，但这并不是他的爱好。
以訾为郎，事孝景帝，为武骑常侍，非其好也。
He bought the official position of Lang Guan with his money and served Liu Che, the fourth emperor of the Han dynasty, as the constant attendant of imperial guards. But this was not what he really wanted to do.