Sunan Ibn Majah, Volume 5, Book 37, Hadith 4288 (DarusSalam) ⓘ
It was narrated from Bahz bin Hakim, from his father, that his grandfather said: “I heard the Messenger of Allah say: ‘You complete seventy nations, of which you are the best and dearest to Allah.’”
حَدَّثَنَا مُحَمَّدُ بْنُ خَالِدِ بْنِ خِدَاشٍ، حَدَّثَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنْ بَهْزِ بْنِ حَكِيمٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " إِنَّكُمْ وَفَّيْتُمْ سَبْعِينَ أُمَّةً أَنْتُمْ خَيْرُهَا وَأَكْرَمُهَا عَلَى اللَّهِ " .
also referenced under: Hadith 4288 (Reference) & Book 37, Hadith 4429 (In-Book)