Musannaf Ibn Abi Shayba 37:252

Abu al-Ahwas narrated to us, from Ubayd Allah ibn Sharik, from Bishr ibn Ghalib, who said: Abd Allah ibn al-Zubayr met al-Husayn ibn Ali in Mecca and said: "O Abu Abd Allah, it has reached me that you intend to go to Iraq." He said: "Yes." He said: "Do not do it, for they are the killers of your father and the ones who stabbed the stomach of your brother. If you go to them, they will kill you."