Sahih Muslim 1558
Sahih Muslim · Book 22: The Book of Musaqah · It is recommended to waive debts
Ka'b b. Malik reported that he made a demand for the payment of the debt that Ibn Abu Hadrad owed to him. This hadith is narrated through another chain of transmitters and (the words are):
قَالَ مُسْلِمٌ وَرَوَى اللَّيْثُ بْنُ سَعْدٍ ، حَدَّثَنِي جَعْفَرُ بْنُ رَبِيعَةَ ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ، هُرْمُزَ عَنْ عَبْدِ اللَّهِ بْنِ كَعْبِ بْنِ مَالِكٍ ، عَنْ كَعْبِ بْنِ مَالِكٍ ، أَنَّهُ كَانَ لَهُ مَالٌ عَلَى عَبْدِ اللَّهِ بْنِ أَبِي حَدْرَدٍ الأَسْلَمِيِّ فَلَقِيَهُ فَلَزِمَهُ فَتَكَلَّمَا حَتَّى ارْتَفَعَتْ أَصْوَاتُهُمَا فَمَرَّ بِهِمَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " يَا كَعْبُ " . فَأَشَارَ بِيَدِهِ كَأَنَّهُ يَقُولُ النِّصْفَ فَأَخَذَ نِصْفًا مِمَّا عَلَيْهِ وَتَرَكَ نِصْفًا .
" He had to get the loan from Abdullah b. Hadrad al-Aslami. He met him and pressed him for payment. There was an altercation between them, until their voices became loud. There happened to pass by them Allah's Messenger (ﷺ) and he said: O Ka'b, and pointed out with his hand in such a way as he meant half. So he got half of what he (Ibn Abu Hadrad) owed to him and remitted the half."