Sahih Al Bukhari Hadith Number 2418

Narrated `Abdullah bin Ka`b bin Malik: Ka`b demanded his debt back from Ibn Abi Hadrad in the Mosque and their voices grew louder till Allah’s Messenger (peace be upon him) heard them while he was in his house. He came out to them raising the curtain of his room and addressed Ka`b, “O Ka`b!” Ka`b replied, “Labaik, O Allah’s Messenger (peace be upon him).” (He said to him), “Reduce your debt to one half,” gesturing with his hand. Ka`b said, “I have done so, O Allah’s Apostle!” On that the Prophet peace be upon him) said to Ibn Abi Hadrad, “Get up and repay the debt, to him.”