Musnad Ahmad 28:187

Husayn ibn Muhammad narrated to us, Muhammad ibn Rashid narrated to us, from Sulayman, from ‘Amr ibn Shu‘ayb, from his father, from his grandfather: "That the Prophet, may Allah bless him and grant him peace, decreed that whoever kills by mistake, his blood money is one hundred camels: thirty bint makhad (one-year-old female camels), thirty bint labun (two-year-old female camels), thirty hiqqah (three-year-old female camels), and ten ibnu labun (two-year-old male camels)."