Imam Hussain's words in Karbala

Imam Hussain, peace be upon him, said: "Why do you regard killing me as Halal? Have I changed any Halal to Haram or any Haram to Halal?" A cursed man said: "We fight you because of the hatred that we have for your father." This is when it is said that Imam Hussain, peace be upon him, cried; [because] the one whom he has to express his love for, he expresses enmity towards him.