It is narrated from Sayyiduna Abu Usayd al-Ansari (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) said: "The best of the households of the Ansar are Banu al-Najjar, then Banu Abd al-Ashhal, then Banu al-Harith bin al-Khazraj, then Banu Sa'idah; and in every household of the Ansar there is good." At this Sa'd bin Ubadah said: I see that the Messenger of Allah (peace and blessings be upon him) has given others preference over us. He (peace and blessings be upon him) said: "You too have been given preference over many."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16628