Narrated Jabir bin 'Abdullah:
that the Messenger of Allah (ﷺ) said: "The best house of the Ansar is Banu An-Najjar." (JA)
English reference (JA): Vol. 1, Book 46, Hadith 3912 (JA)
Arabic reference (JA): Book 49, Hadith 4290 (JA)