Musnad Ahmad 27:619

He said: I found in my father’s book: Yazid narrated to us, Muhammad ibn Ishaq informed us, from Nafi’, from Ibn ‘Umar, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, while he was on the pulpit: A man asked him about the dabb (lizard), and he said: "I do not eat it, nor do I forbid it."