《资治通鉴·梁纪·梁纪十二》
夏州长史于谨对宇文泰说： 您占据了关中险要而容易固守的地方，将士们骁勇善战，土地肥沃富饶。
夏州长史于谨言于泰曰： 明公据关中险固之地，将士骁勇，土地膏腴。
Xiazhou Recorder Yu Jin said to Yuwen Tai: "You occupied a favorable location in Guanzhong  that is easy to defend, your soldiers are valiant and good at fighting, and the land is fertile and rich."