From Sahih Muslim (Hadith 5032):
Ibn 'Umar reported that there were some persons with Allah's Apostle (ﷺ) from among his Companions, Sa'd being one of them. There was brought to them the flesh of the lizard when a lady amongst the wives of Allah's Apostle (ﷺ) said:It is the flesh of the lizard. Thereupon Allah's Messenger (way peace be upon him) said: Eat, for it is lawful, but it is not my diet
Reference: Muslim 5032