Musannaf Ibn Abi Shayba 18:660

Abu Bakr narrated to us, he said: Ibn Numayr and Ya’la ibn ‘Ubayd narrated to us, from ‘Abd al-Malik, from ‘Ata’, regarding a man who was attacked by a stallion, so he struck it with a sword; is he liable? He said: Yes. Except that Ibn Numayr said: He is not liable.