Tawbah al-Anbari (may Allah have mercy on him) says: Al-Sha'bi (may Allah have mercy on him) said to me: Have you seen al-Hasan (may Allah have mercy on him) when he narrates from the Prophet (peace and blessings be upon him)? I sat with Ibn Umar (may Allah be pleased with them both) for nearly two years and did not hear him narrate from the Prophet (peace and blessings be upon him), except that one day he said: Some people from among the Companions of the Messenger of Allah (peace and blessings be upon him), among them Sa'd bin Malik (may Allah be pleased with him), were eating a lizard (dabb) while sitting with him (peace and blessings be upon him). One of the wives of the Prophet (peace and blessings be upon him) called out that it was lizard, so the people stopped eating. The Messenger of Allah (peace and blessings be upon him) said: "Eat, for it is not unlawful and there is no harm in it, but it is not the food of my people."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19411