《旧唐书·列传·卷七十八》
皇上同意，满朝官员都吓呆了。李勉听说这事，认为损失一位老臣会给朝廷带来羞辱，就秘密奏本请求留住。
上从之，朝廷失色，李勉闻之，以为失一元老，贻朝廷羞，乃密表请留。
The Emperor agreed, and all the court officials were dumbstruck with astonishment. Li Mian heard about this matter and felt that to lose such an accomplished old minister would bring disgrace on the court, so he secretly submitted a memorial requesting that he be spared.