Musannaf Ibn Abi Shaybah

Hazrat Ash'ath narrates that Hazrat Ibn Sirin said: A man made his son ride a horse so that he could present the horse for sale. He drove a nail into the horse's haunch to make it run faster and called out to it, so the horse killed his son. Thus, the responsibility for the blood money was placed upon his family members, and the father was not made an heir to anything.