Sunan an-Nasa'i
The Book of al-Fara' and al-'Atirah
كتاب الفرع والعتيرة
Chapter 8: The Prohibition Of Using The Fat Of Dead Animals) Al-Maitah)
It was narraterd from Jabir bin 'Abdullah that, during the year of the Conquest, while he was in Makkah, he heard the Messenger of Allah say
"Allah, the Mighty and Sublime, and His Messenger have forbidden the sale of alcohol, dead meat, pigs and idols." It was said to him: "O Messenger of Allah, what do you think of their fat of dead animals, for it is used to caulk ships, it is daubed on animal skins, and people use it to light their lamps?" He said: "No, it is unlawful." Then the Messenger of Allah said: "May Allah, the Mighty and Sublime, curse the Jews, for Allah forbade them the fat (of dead animals) but they rendered it, sold it, and consumed its price."
Chapter 10: If A Mouse Falls Into The Cooking Fat
It was narrated from Ibn' Abbas, from Maimunah, that
the Prophet was asked about a mouse that fell into the cooking fat. He said: "If it (the fat) is solid, then throw it away, and whatever is around it. If it is liquid then do not use it at all."(Daif)