Musannaf Ibn Abi Shayba 16:162

Abu Bakr narrated to us, he said: Ibn ‘Uyaynah narrated to us, from al-Zuhri, from ‘Ubayd Allah, from Ibn ‘Abbas, from Maymunah: The Messenger of Allah (peace and blessings of Allah be upon him) was asked about a mouse that fell into ghee and died. He said: "Discard it and what is around it, and eat it."