Musannaf Ibn Abi Shayba 16:167

Abu Bakr narrated to us, he said: Ibn ‘Ulayyah narrated to us, from Ayyub, from Nafi’, from Safiyyah bint Abi ‘Ubayd, that a jar belonging to the family of Ibn ‘Umar, containing twenty faraq of ghee or more, had a mouse fall into it and die. Ibn ‘Umar ordered them to use it for lighting.