Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abdullah bin Abbas that he said: Hazrat Hussain came to me for consultation regarding going towards Iraq. I said to him, if they would not find fault with you and me, I would firmly hold you back, asking where are you going—to those people who martyred your father and struck your brother with spears? Regarding the generosity he showed me in this matter, he said: If this Haram (sacred sanctuary) is made lawful for fighting for any man, then I would prefer to be killed in such-and-such land, even though it is far, rather than be like the man for whom fighting in the Haram is considered lawful.