It is narrated from Sayyiduna Mu'awiyah bin Haydah (may Allah be pleased with him) that he said: I heard the Prophet (peace and blessings be upon him) say: "You complete the number of seventy nations; you are the best of them and the most honoured of them before Allah, the Mighty and Majestic."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17072