كتاب المناقب
Read the English translation first, with the original Arabic directly underneath.
Narrated Ibn `Umar:
The Prophet (ﷺ) said, "Authority of ruling will remain with Quraish, even if only two of them remained."
لا يَزَالُ هَذَا الأَمْرُ فِي قُرَيْشٍ، مَا بَقِيَ مِنْهُمُ اثْنَانِ