It is narrated from Sayyidah Umm Hani bint Abi Talib (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Allah has favoured Quraysh with seven qualities which were not given to anyone before them and will not be given to anyone after them: Allah has favoured Quraysh in that I am from among them; prophethood is among them; the custodianship of the Ka'bah (hijabah) is among them; the giving of water to the pilgrims (siqayah) is among them; Allah helped them against the people of the Elephant; they worshipped Allah for ten years when no one other than them worshipped Him; and Allah revealed concerning them a surah of the Qur'an which was not revealed concerning anyone other than them."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21362