Narrated `Abdullah bin Ka`b bin Malik from Ka`b bin Malik: `Abdullah bin Abu Hadrad Al-Aslami owed Ka`b bin Malik some money. One day the latter met the former and demanded his right, and their voices grew very loud. The Prophet (ﷺ) passed by them and said, "O Ka`b," beckoning with his hand as if intending to say, "Deduct half the debts." So, Ka`b took half what the other owed him and remitted the other half.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ جَعْفَرِ بْنِ رَبِيعَةَ، عَنِ الأَعْرَجِ، قَالَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ كَعْبِ بْنِ مَالِكٍ، عَنْ كَعْبِ بْنِ مَالِكٍ، أَنَّهُ كَانَ لَهُ عَلَى عَبْدِ اللَّهِ بْنِ أَبِي حَدْرَدٍ الأَسْلَمِيِّ مَالٌ، فَلَقِيَهُ فَلَزِمَهُ حَتَّى ارْتَفَعَتْ أَصْوَاتُهُمَا، فَمَرَّ بِهِمَا النَّبِيُّ صلى الله عليه وسلم فَقَالَ " يَا كَعْبُ ". فَأَشَارَ بِيَدِهِ كَأَنَّهُ يَقُولُ النِّصْفَ. فَأَخَذَ نِصْفَ مَا عَلَيْهِ وَتَرَكَ نِصْفًا.
sunnah.com