Narrated Az-Zuhri: as follows in Hadith 297.
Vol: 004 Book: 052 Hadith: 296
Narrated Ibn Umar: The Prophet said, "Authority of ruling will remain with Quraish, even if only two of them remained."
Vol: 004 Book: 056 Hadith: 705
O Allah, bless us in it and provide us with better than it.
Info: At-Tirmidhi 5/506. See also Al-Albani, Sahih At-Tirmidhi 3/158.