Narrated Abu Usaid:
The Prophet ﷺ said, "The best of the Ansar's families (homes) are those of Banu An-Najjar and then (those of) Banu 'Abdul Ash-hal, then (those of) Banu Al-Harith bin Al-Khazraj and then (those of) Banu Sa'ida;
nevertheless, there is good in all the families (houses) of the Ansar." On this, Sad (bin Ubada) said, "I see that the Prophet has preferred some people to us." Somebody said (to him), "No, but he has given you superiority to many."
وَقَالَ عَبْدُ الصَّمَدِ حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا قَتَادَةُ، سَمِعْتُ أَنَسًا، قَالَ أَبُو أُسَيْدٍ عَنِ النَّبِيِّ صلى الله عليه وسلم بِهَذَا، وَقَالَ سَعْدُ بْنُ عُبَادَةَ.
Sahih al-Bukhari, 3789
Sahih al-Bukhari, Vol. 5, Book of Merits of Al-Ansaar, Hadith 133
Sahih al-Bukhari, Book of Merits of Al-Ansaar, Hadith 133