Sahih Bukhari Volume 003, Book 036, Hadith Number 466.

Narated By Ya'la bin Umaya : I fought in Jaish-al-Usra (Ghazwa of Tabuk) along with the Prophet and in my opinion that was the best of my deeds. Then I had an employee, who quarrel led with someone and one of the them bit and cut the other's finger and caused his own tooth to fall out. He then went to the Prophet (with a complaint) but the Prophet cancelled the suit and said to the complainant, "Did you expect him to let his finger in your mouth so that you might snap and cut it (as does a stallion camel)?"

Narrated Ibn Juraij from Abdullah bin Abu Mulaika from his grandfather a similar story: A man bit the hand of another man and caused his own tooth to fall out, but Abu Bakr judged that he had no right for compensation (for the broken tooth).