Hisham bin Yazid said: I heard Anas bin Malik (may Allah be pleased with him) saying: Abu Bakr and al-Abbas (may Allah be pleased with them both) passed by one of the gatherings of the Ansar while they were weeping. He said: Why are you weeping? They said: We are weeping remembering our sitting with the Messenger of Allah (peace and blessings be upon him). So Abu Bakr (may Allah be pleased with him) went in to the Prophet (peace and blessings be upon him) and informed him (peace and blessings be upon him). He (peace and blessings be upon him) came out with a band tied around his head. He climbed the pulpit, and he did not climb it after that. He (peace and blessings be upon him) praised and glorified Allah, then said: "I enjoin you to treat the Ansar well, for they are my body and soul. They have fulfilled all their obligations, but the reward due to them remains. So accept the good from those of them who do good, and overlook the faults of those of them who do wrong."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 13108