'Abdallah b. ‘Amr reported God's Messenger as saying, “The blood wit for unintentional murder which resembles intentional, such as is done with a whip and a stick, is a hundred camels, forty of which are pregnant.”
Nasa'i, Ibn Majah and Darimi transmitted it, and Abu Dawud transmitted it both on his authority and on that of Ibn ‘Umar. Sharh as-sunna has the wording in al-Masabih on the authority of Ibn ‘Umar.