Al-Lu'lu' wal-Marjan — Hadith #36761

A man came to the Prophet (peace and blessings of Allah be upon him) to ask for a debt and began to speak harshly. The companions tried to discipline him. Then the Messenger of Allah (may peace be upon him) said, Leave him alone. Because creditors have the right to speak harshly. Then he said, Give him a camel of the same age as his camel. They said, O Messenger of God! It doesn't exist. There are better camels than this. He said, give it to me. The best of you, that debt Better on payment. (Bukhari Part 40: /6, Ha: 2306; Muslim 22/22, Ha: 1601)