Sayyiduna Anas bin Malik (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "O Allah, forgive the Ansar, the sons of the Ansar, and the grandsons of the Ansar, and forgive also their daughters-in-law and neighbours."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 731