Musnad Ahmad 30:632

'Abd al-Razzaq narrated to us, Hisham informed us, from Muhammad, from Abu Hurayrah, who said: "The mouse is a metamorphosed creature, the proof of which is that the milk of camels is brought near to it, but it does not taste it, while the milk of sheep is brought near to it, and it drinks it—or he said: it eats it." Ka'b said to him: "Is this something you heard from the Messenger of Allah, peace and blessings of Allah be upon him?" He replied: "Was the Torah revealed to me?"