Musannaf Ibn Abi Shayba 19:447

Abu Bakr narrated to us, he said: Ubayd Allah ibn Musa narrated to us, from Ibrahim ibn Isma'il, from Dawud ibn Husayn, from 'Ikrimah, from Ibn 'Abbas, from the Prophet, peace and blessings of Allah be upon him, who said: "Kill the one who commits the act with the animal, and [kill] the animal."