Musnad Ahmad 3:63

Isma'il ibn Aban al-Warraq narrated to us, Ya'qub narrated to us, from Ja'far ibn Abi al-Mughirah, from Ibn Abza, from Uthman ibn Affan, who said: Abdullah ibn al-Zubayr said to him when he was besieged: "I have noble camels that I have prepared for you. Would you like to move to Makkah, so that whoever wishes to come to you may come to you?" He said: "No, for I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'A ram from Quraysh will commit heresy in Makkah, his name is Abdullah, upon him is like half the sins of the people.'"