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.  

أَنَّهُ كَانَ لَهُ عَلَى عَبْدِ اللَّهِ بْنِ أَبِي حَدْرَدٍ الأَسْلَمِيِّ دَيْنٌ فَلَقِيَهُ فَلَزِمَهُ فَتَكَلَّمَا حَتَّى ارْتَفَعَتْ أَصْوَاتُهُمَا فَمَرَّ بِهِمَا النَّبِيُّ ﷺ فَقَالَ يَا كَعْبُ وَأَشَارَ بِيَدِهِ كَأَنَّهُ يَقُولُ النِّصْفَ فَأَخَذَ نِصْفَ مَا عَلَيْهِ وَتَرَكَ نِصْفًا