I heard the Messenger of Allah ﷺ say: Islam will continue to be triumphant until there have been twelve Caliphs. Then the Prophet ﷺ said something which I could not understand. I asked my father: What did he say? He said: He has said that all of them (twelve Caliphs) will be from the Quraish.
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ يَزَالُ الإِسْلاَمُ عَزِيزًا إِلَى اثْنَىْ عَشَرَ خَلِيفَةً ثُمَّ قَالَ كَلِمَةً لَمْ أَفْهَمْهَا فَقُلْتُ لأَبِي مَا قَالَ فَقَالَ كُلُّهُمْ مِنْ قُرَيْشٍ