《北史·列传·卷十一》
周文帝到夏州时，让于谨当防城大都督，兼夏州长史。
周文帝临夏州，以谨为防城大都督，兼夏州长史。
When Emperor Wen of the Zhou Dynasty arrived in Xiazhou, he appointed Yu Jin as the Grand Governor of Fangcheng and concurrently the Prefect of Xiazhou.