Sahih Muslim Book 016, Hadith Number 4148.

Chapter : When anyone attacks the life of a person, or his limb and the victim wards off the attack and in self-defence either the life of the assailant is lost or his limb broken, there would be no penalty on the victim.

Safwan b. Ya'la b. Munya reported on the authority of his father that there came to Allah's Apostle (may peace be upon him) a person who had bitten the hand of another person and who had withdrawn his hand (and as a result thereof) his foreteeth had fallen (those which had bitten). The Apostle of Allah (may peace be upon him) turned down his (claim), and said: Do you wish to bite as the camel bites?

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