Musannaf Ibn Abi Shayba 16:124

Abu Bakr narrated to us, he said: Yazid ibn Harun narrated to us, he said: Dawud narrated to us, from Abu Nadra, who said: Umar said: "Indeed, Allah brings benefit through the dabb (lizard). For it is food for the generality of the shepherds, and if I had some, I would have eaten from it."