Musnad Ahmad 32:85

Ibn Abi ‘Adi narrated to us, from Humayd, from Anas, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Shall I not inform you of the best of the houses of the Ansar? The house of Banu al-Najjar, then the house of Banu ‘Abd al-Ashhal, then the house of Banu al-Harith ibn al-Khazraj, then the house of Banu Sa‘idah. And in all the houses of the Ansar there is goodness."