It is narrated from Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "O Allah! Forgive the Ansar, the sons of the Ansar, and the mawali (freed slaves) of the Ansar: 'Allahummaghfir lil-Ansar, wa abna'il-Ansar, wa mawalil-Ansar.'"
No one narrated this hadith from Jabir (may Allah have mercy on him) except Zuhayr (may Allah have mercy on him), and Yahya bin Adam (may Allah have mercy on him) is alone in narrating it.