《贞观政要·卷二·论任贤》
贞观十七年，高宗还在东宫时，调任李为太子詹事，追加特进的待遇，仍担任知政事。
十七年，高宗居春宫，转太子詹事，加特进，仍知政事。
In 643, when Gaozong was still the crown prince, Li was reassigned to be the tutor of the crown prince, and his additional treatment was raised to Tejin. He continued to be in charge of civil and political affairs.