Hadith No: 1

Narrated Jabir bin Samura: I heard the Prophet (s.a.w.a.) saying, "There will be twelve Muslim rulers." He then said a sentence which I did not hear. My father the he (s) said, "All of them will be from Quraish."

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Reference: Saheeh al-Bukhari Book 93 Tradition No. 7222

Hadith No: 2
Al-Bukhari - al-Tarikh al-Kabir - Chapter on the letter Ya - 3520: Yunus ibn Abi Ya'fur al-Abdi
Volume: (8) - Page Number: (410/411)
3520 - Yunus ibn Abi Ya'fur al-Abdi, and his father's name was Waqdan. Fazil ibn Abd al-Wahhab said: Yunus ibn Abi Ya'fur al-Abdi narrated to us, saying: "Awn ibn Abi Jahifeh narrated to us from his father, who said: I heard the Prophet (peace be upon him and his holy progeny) say: 'The affair of my ummah will remain righteous until twelve caliphs have passed, all of them from Quraysh.'"

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Reference: Tarikh al Kabeer Book 8