From Sahih Muslim (Hadith 6424):
Ibrahim b. Muhammad b. Talha reported:I heard Abu Sa'ld delivering an address in the presence of Abu 'Utba that the Messenger of Allah (ﷺ) said: The worthiest settlements of the Ansar are those of Banu Najjar, then of Banu 'Abu al-Ashhal and then of Banu Harith and then of Banu Khazraj and then of the clan of Banu Sa'idah, and if I were to give preference to anyone besides them I would have given preference to my relatives
Reference: Muslim 6424