Sayyiduna al-Abbas (may Allah be pleased with him) narrates: I said: "O Messenger of Allah! After Sayyiduna Abu Bakr (may Allah be pleased with him), I have not seen anyone more faithful (to the covenant) than those people of Quraysh who became Muslim in Makkah on the occasion of its conquest." The Prophet (peace and blessings be upon him) said: "O Allah! Grant Quraysh understanding of the religion, and from this day of mine until the end of time keep bestowing Your gifts upon them, just as You previously made them taste punishment."
Al-Bazzar and al-Tabarani recorded it; its chain contains a narrator, Abdullah bin Shabib, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16455