Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "People are followers of Quraysh in this matter: their Muslims follow the Muslims of Quraysh, and their disbelievers follow the disbelievers of Quraysh."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5295