《北史·列传·卷三十七》
天和三年，周武帝认为他的经书学有渊源，命他教授几位皇子。
天和三年，周武帝以徵经有师法，诏令授皇诸子。
In the third year of the Tianhe era, Emperor Wu of Zhou believed that his classics were well-founded, and ordered him to teach several princes.