《隋书·列传·卷二十六》
按老规矩，左卫率为四品官。皇上因宇文述一向官高，于是把左卫率定为三品官。他就是这样被看重。
旧令，率官第四品，上以述素贵，遂进率品为第三，其见重如此。
According to the old rules, the commander of the Left Imperial Guards was a fourth-rank official. Because Yuwenshu had always been a high-ranking official, the emperor made the commander of the Left Imperial Guards a third-rank official. This was how much he was valued.