《周书·本纪·卷一》
等到返回，左担表奏魏孝武帝说： 臣以前与原闱西大都督臣贺拔岳，竭诚为国，他意外死于非命，三军丧失斗志，朝野痛惜。
及元毗还，太祖表于魏帝曰： 臣前以故关西大都督臣岳，竭诚奉国，横罹非命，三军丧气，朝野痛惜。
After returning, Zuo Du reported to Emperor Xiao Wu of Wei: “I used to work with He Baye, Minister of General Dufu Xi, and I devoted myself to the country. He unexpectedly died, the army lost its fighting spirit and the court and the public mourned.”