Musnad Ahmad 30:3463

Yazid narrated to us, Hisham informed us, from Muhammad, who said: Abu Hurayrah said: "The mouse is among those who were transformed, and I will inform you of the sign of that: if the milk of camels is placed before it, it does not partake of it, and if the milk of sheep is placed before it, it partakes of it." He said: Ka'b said to him: "Did the Messenger of Allah, may Allah bless him and grant him peace, say that?" He said: Abu Hurayrah replied: "Was the Torah revealed to me?"