It is narrated from a Companion (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) stood one day to deliver a sermon, praised Allah, supplicated for the forgiveness of the martyrs of Uhud, and said: "O group of Muhajireen! Your numbers will increase, but the numbers of the Ansar will not increase. The Ansar are my confidants, with whom I found refuge. Honor their honorable ones and pardon their wrongdoers, for they have fulfilled their responsibilities and now only their rights remain."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21951