That ʿAbdullah bin Abi Hadrad Al-Aslami owed him some debt. Kaʿb met him and caught hold of him and they started talking and their voices grew loudest. The Prophet ﷺ passed by them and addressed Kaʿb, pointing out to him to reduce the debt to one half. So, Kaʿb got one half of the debt and exempted the debtor from the other half. (Using translation from Bukhārī 2424)
أَنَّهُ كَانَ لَهُ مَالٌ عَلَى عَبْدِ اللهِ بْنِ أَبِي حَدْرَدٍ الْأَسْلَمِيِّ فَلَقِيَهُ فَلَزِمَهُ فَتَكَلَّمَا حَتَّى ارْتَفَعَتِ الْأَصْوَاتُ فَمَرَّ بِهِمَا رَسُولُ اللهِ ﷺ فَقَالَ يَا كَعْبُ وَأَشَارَ بِيَدِهِ كَأَنَّهُ يَقُولُ النِّصْفَ فَأَخَذَ نِصْفَ مَا عَلَيْهِ وَتَرَكَ نِصْفًا