It has been narrated on the authority of Jabir b. Samura who said:
I joined the company of the Prophet (ﷺ) with my father and I heard him say: This Caliphate will not end until there have been twelve Caliphs among them. The narrator said: Then he (the Holy Prophet) said something that I could not follow. I said to my father: What did he say? He said: He has said: All of them will be from the Quraish.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ حُصَيْنٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ح وَحَدَّثَنَا رِفَاعَةُ بْنُ الْهَيْثَمِ الْوَاسِطِيُّ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ عَبْدِ اللَّهِ الطَّحَّانَ - عَنْ حُصَيْنٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ دَخَلْتُ مَعَ أَبِي عَلَى النَّبِيِّ صلى الله عليه وسلم فَسَمِعْتُهُ يَقُولُ " إِنَّ هَذَا الأَمْرَ لاَ يَنْقَضِي حَتَّى يَمْضِيَ فِيهِمُ اثْنَا عَشَرَ خَلِيفَةً " . قَالَ ثُمَّ تَكَلَّمَ بِكَلاَمٍ خَفِيَ عَلَىَّ - قَالَ - فَقُلْتُ لأَبِي مَا قَالَ قَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
Reference : Sahih Muslim 1821 a
In-book reference : Book 33, Hadith 5
USC-MSA web (English) reference : Book 20, Hadith 4477
It has been reported on the authority of Jabir b. Samura who said:
I heard the Messenger of Allah (ﷺ) say: The affairs of the people will continue to be conducted (well) as long as they are governed by twelve men. Then the Prophet (ﷺ) said words which were obscure to me. I asked my father: What did the Messenger of Allah (ﷺ) say? He said: All of the (twelve men) will be from the Quraish.
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " لاَ يَزَالُ أَمْرُ النَّاسِ مَاضِيًا مَا وَلِيَهُمُ اثْنَا عَشَرَ رَجُلاً " . ثُمَّ تَكَلَّمَ النَّبِيُّ صلى الله عليه وسلم بِكَلِمَةٍ خَفِيَتْ عَلَىَّ فَسَأَلْتُ أَبِي مَاذَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
Reference : Sahih Muslim 1821 b
In-book reference : Book 33, Hadith 6
USC-MSA web (English) reference : Book 20, Hadith 4478
This hadith has been narrated on the authority of Jabir b. Samura through another chain of transmitters.
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ سِمَاكِ بْنِ جَابِرِ بْنِ سَمُرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم بِهَذَا الْحَدِيثِ وَلَمْ يَذْكُرْ " لاَ يَزَالُ أَمْرُ النَّاسِ مَاضِيًا " .
Reference : Sahih Muslim 1821 c
In-book reference : Book 33, Hadith 7
USC-MSA web (English) reference : Book 20, Hadith 4479
It has been narrated on the authority of Jabir b. Samura who said:
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.
حَدَّثَنَا هَدَّابُ بْنُ خَالِدٍ الأَزْدِيُّ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ سِمَاكِ بْنِ حَرْبٍ، قَالَ سَمِعْتُ جَابِرَ بْنَ سَمُرَةَ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " لاَ يَزَالُ الإِسْلاَمُ عَزِيزًا إِلَى اثْنَىْ عَشَرَ خَلِيفَةً " . ثُمَّ قَالَ كَلِمَةً لَمْ أَفْهَمْهَا فَقُلْتُ لأَبِي مَا قَالَ فَقَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
Reference : Sahih Muslim 1821 d
In-book reference : Book 33, Hadith 8
USC-MSA web (English) reference : Book 20, Hadith 4480
It has been narrated on the authority of Jabir b. Samura that the Prophet (ﷺ) said:
This order will continue to be dominant until there have been twelve Caliphs. The narrator says: Then he said something which I could not understand, and I said to my father: What did he say? My father told me that he said that all of them (Caliphs) would be from the Quraish.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ دَاوُدَ، عَنِ الشَّعْبِيِّ، عَنْ جَابِرِ، بْنِ سَمُرَةَ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " لاَ يَزَالُ هَذَا الأَمْرُ عَزِيزًا إِلَى اثْنَىْ عَشَرَ خَلِيفَةً " . قَالَ ثُمَّ تَكَلَّمَ بِشَىْءٍ لَمْ أَفْهَمْهُ فَقُلْتُ لأَبِي مَا قَالَ فَقَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
Reference : Sahih Muslim 1821 e
In-book reference : Book 33, Hadith 9
USC-MSA web (English) reference : Book 20, Hadith 4481
So we have the number 12 being repeated continuously. No number apart from 12. So how are you going to come up with the number 12? Who are you going to add and who to subtract?