Bukhari Collection: ::Book Number 3:: Hadith # 606
Narrated `Abdullah bin Ka`b bin Malik Al-Ansari from Ka`b bin Malik:That `Abdullah bin Abi Hadrad Al-Aslami owed him some debt. Ka`b met him and caught hold of him and they started talking and their voices grew loudest. The Prophet passed by them and addressed Ka`b, pointing out to him to reduce the debt to one half. So, Ka`b got one half of the debt and exempted the debtor from the other half.