Asim bin Umar bin Qatadah narrated from his father, from his grandfather, Sayyiduna Qatadah bin al-Nu'man (may Allah be pleased with him), that he said something about Quraysh, as though he spoke ill of them. The Prophet (peace and blessings be upon him) said: "Easy, O Qatadah! Do not revile Quraysh, for soon you will see among them men beside whose deeds your deeds, and beside whose actions your actions, will seem insignificant. Were it not that I fear Quraysh would become arrogant, I would tell them what standing they have with Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب القاف / 16060