《宋史·列传·卷八十八》
御史林旦、薛昌朝说，不宜让不孝之人居于劝讲之位，而且一并弹劾王安石，王安石要求罢免二人。李定自己也感到很不安，请求解除官职，于是以集贤校理、检正中书吏房、直舍人院同判太常寺。
御史林旦、薛昌朝言，不宜以不孝之人居劝讲之地，并论安石，章六七上，安石又白罢两人，定亦不自安，蕲解职，以集贤校理、检正中书吏房、直舍人院同判太常寺。
History Lin Dan and Xue Changchao said that it is not appropriate for unfilial people to live in a position of persuasion, and also impeached Wang Anshi at the same time. Wang Anshi demanded their dismissal. Li Ding was also very uneasy and asked to be dismissed from his post, so he became a Jixian proofreader, an inspector of the Zhongshu official room, and a member of the Sherrenyuan to judge Taichang Temple.