《贞观政要·卷二·论任贤》
叛乱平定之后，李世民成为东宫太子，就请房玄龄担任太子左庶子。
及事平，太宗入春宫，擢拜太子左庶子。
After the rebellion was put down, Li Shimin became the crown prince of the east palace and invited Fang Xuanling to serve as the crown prince's left shuzi.