《隋书·列传·卷五》
元胄此时值班时间已到，应该下班，但他没去，对皇上上奏说： 我不离开您，是为了防备元竁罢了。 
胄时当下直，不去，因奏曰： 臣不下直者，为防元旻耳。 
At this time, Yuan Zhe’s shift was over and he should get off work, but he did not leave, and he played up to the emperor, saying: I don't leave you just to guard against Yuan Liao.