It is narrated from Harith bin Abdur Rahman, he said: It has reached us that the Messenger of Allah ﷺ said: "If the Quraysh had not been ungrateful (and arrogant), I would have told them what (blessings) Allah has for them."
Hadith Referenceمسند الإمام الشافعي / كتاب فضائل قريش وغيرهم وأبواب متفرقة / 1778
Hadith Takhrijاسناده ضعیف الاعضاله اخرجه البيهقى فى المعرفة السنن والآثار (88/1)۔