عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَتَبَ كِتَابًا بَيْنَ الْمُهَاجِرِينَ وَالْأَنْصَارِ أَنْ يَعْقِلُوا مَعَاقِلَهُمْ وَأَنْ يَفْدُوا عَانِيَهُمْ بِالْمَعْرُوفِ وَالْإِصْلَاحِ بَيْنَ الْمُسْلِمِينَ
It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) wrote an agreement between the Muhajirun and the Ansar that they would pay each other's blood money, and they would pay the recognized ransom to free their captives, and they would strive for reconciliation among the Muslims.