Ubaidullah bin Umair says that I was sitting with Sulaiman bin Ali, when an elder from the Quraysh arrived. Sulaiman said: Look! Seat the Sheikh in a good place because it is the right of the Quraysh. I said: Governor! Shall I narrate to you a hadith that whoever insults the Quraysh, it is as if he insults Allah? He said: Subhan Allah! How excellent, who narrated this to you? I said: Rabee’ah bin Abi Abdur Rahman narrated it to me from Sa’eed bin al-Musayyib (may Allah have mercy on him), who narrated from Amr bin Uthman, that my father said to me: Son! If you are ever given leadership over any place, honor the Quraysh, because I heard the Prophet (peace and blessings be upon him) say: Whoever insults the Quraysh, it is as if he insults Allah.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 460
Hadith Gradingحکم دارالسلام:حسن لغيره، محمد بن حفص والد عبيد الله وعمه عبيدالله بن عمر لم يوثقهما غير ابن حبان