《北史·列传·卷六十七》
按照旧有的法令，率官为四品官，因为宇文述平常就很宠贵，就晋位率官为三品官。宇文述受到的重视如此。
旧令，率官第四品，以述素贵，遂进率品第三，其见重如此。
According to the old laws, the chief military official was a fourth-rank official, but because Yuwen Shu was quite the favorite, he was promoted to chief military official to the third rank. Such was the importance Yuwen Shu received.