Abu Bakr and Al-ʿAbbas passed by one of the gatherings of the Ansar who were weeping then. He (i.e. Abu Bakr or Al-ʿAbbas) asked, "Why are you weeping?" They replied, "We are weeping because we remember the gathering of the Prophet ﷺ with us." So Abu Bakr went to the Prophet ﷺ and told him of that. The Prophet ﷺ came out, tying his head with a piece of the hem of a sheet. He ascended the pulpit which he never ascended after that day. He glorified and praised Allah and then said, "I request you to take care of the Ansar as they are my near companions to whom I confided my private secrets. They have fulfilled their obligations and rights which were enjoined on them but there remains what is for them. So, accept the good of the good-doers amongst them and excuse the wrongdoers amongst them." (Using translation from Bukhārī 3799)   

مَا يُبْكِيكُمْ؟ قَالُوا مَجْلِسُنَا مِنَ النَّبِيِّ ﷺ فَدَخَلَ أَبُو بَكْرٍ ؓ عَلَى النَّبِيِّ ﷺ فَأَخْبَرَهُ فَخَرَجَ وَقَدْ عَصَبَ رَأْسَهُ بِحَاشِيَةِ ثَوْبٍ فَصَعِدَ الْمِنْبَرَ وَلَمْ يَصْعَدْ بَعْدَ ذَلِكَ فَحَمِدَ اللهَ وَأَثْنَى عَلَيْهِ فَقَالَ أُوصِيكُمْ بِالْأَنْصَارِ؛ فَإِنَّهُمْ كَرِشِي وَعَيْبَتِي وَقَدْ قَضَوَا الَّذِي عَلَيْهِمْ وَبَقِيَ الَّذِي لَهُمْ فَاقْبَلُوا مِنْ مُحْسِنِهِمْ وَتَجَاوَزُوا عَنْ مُسِيئِهِمْ