From Sahih Bukhari (Hadith 3790):
Narrated Abu Usaid:That he heard the Prophet (ﷺ) saying, "The best of the Ansar, or the best of the Ansar families (homes) are Banu An-Najjar, Bani `Abdul Ash-hal, Banu Al-Harith and Banu Sai'da
Reference: Bukhari 3790