Sahih Bukhari | Volume 5 | Hadith Number 132

Narrated by Abu Hamza
(A man from the Ansar) The Ansar said, "Every nation has followers and (O Prophet) we have followed you, so invoke Allah to let our followers be considered from us (as Ansar like ourselves)." So the Prophet said, "O Allah! Let their followers be considered as Ansar like themselves."