Musnad Ahmad 217:3

Abu al-Mughirah narrated to us, he said: al-Awza’i narrated to us, ‘Abd al-Wahid ibn Qays narrated to us, he said: ‘Urwah ibn al-Zubayr narrated to us, from Karz al-Khuza’i, who said: A Bedouin came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, does this matter have an end?" He said: "Yes. Whoever Allah intends good for, from the non-Arabs or the Arabs, He brings it [the religion] to them. Then tribulations will occur like shadows, in which you will return as black snakes, striking the necks of one another. The best of people on that day is a believer who is secluded in a mountain pass, fearing his Lord, Blessed and Exalted is He, and leaving the people alone from his evil." [‘Abdullah ibn Ahmad said]: My father said: And Muhammad ibn Mus’ab al-Qurqusani narrated to me a hadith similar to the hadith of Ibn al-Mughirah, except that he said: "Karz ibn Hubaysh al-Khuza’i."