《太平广记·卷一百六十七·气义二》
郑倜在东洛办理完丧事以后，回到阳城这里，以履行自己的诺言，阳城说：你如果没有其他的地方可以去，作为同学留在这就可以了，何必要当奴仆呢？
倜东洛茔事罢，杖归城，以副前约。城曰：子奚如是？苟无他系，同志为学可也，何必云役己以相依？
After Zheng Ti finished the funeral in Dongluo, he returned to Yangcheng to fulfill his promise. Yangcheng said: "If you have nowhere else to go, you can stay as a classmate, why do you have to be a slave?"