《礼记·檀弓上》
子路为出嫁的姐姐服丧，到了可以除服的日子他还不除。孔子就问他： 为什么还不除服呢？ 
子路有姊之丧，可以除之矣，而弗除也，孔子曰： 何弗除也？ 
Zi Lu went into mourning for his married sister, and when the time came for the mourning to end he had not stopped it. Confucius asked: "Why do you not stop?"