Sunan Abi dawud:4553 Chapter: A Life For A Life Book 41, Hadith 60

Narrated ‘Uthman b. ‘Affan and Zaid b. Thabit: The bloodwit for what resembled intentional murder should be forty pregnant she-camels in their fifth year, thirty she-camels in their fourth year, and thirty she-camels in their third year. The bloodwit for unintentional murder is thirty she-camels in their fourth year, thirty she-camels in their third year, and twenty she-camels in their second year.