Merits of the Helpers in Madinah (Ansaar)

Bukhari :: Book 5 :: Volume 58 :: Hadith 134

Narrated Abu Usaid:

That he heard the Prophet 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."