Musnad Ahmad 30:3322

Muhammad ibn Abdullah narrated to us, al-Ash'ath narrated to me, from Muhammad, from Abu Hurayrah, that the Prophet (peace and blessings of Allah be upon him) said: "A nation from among the nations was lost, and Allah knows best: is it the mouse or not? Do you not see that if camel milk is placed for it, it does not eat it?"