Chapter 49: The Book of the Etiquette of Judges
It was narrated from Ka' b bin Malik that: He owed a debt by 'Abdullah bin Abi Hadrad Al-Aslami. He met him, and asked him to pay it off. They exchanged words until their voices became loud. The Messenger of Allah [SAW] passed by them and said: "O Ka' b!" and he gestured with his hand to say half. So he took half of what was owed and let him off the other half.
Sunan an-Nasa'i 5414