Musannaf Ibn Abi Shayba 1:523

Ibn ‘Ulayyah narrated to us, from Ayyub, from Wahb ibn Kaysan, from Muhammad ibn ‘Amr, from ‘Ata’, from Ibn ‘Abbas, that the Messenger of Allah (may Allah bless him and grant him peace) ate from a bone or gnawed on a rib, then prayed and did not perform ablution.