regarding an animal, e.g., a mouse or some other animal that had fallen into solid or liquid oil or butter-fat: I had been informed that a mouse had died in butter-fat whereupon Messenger of Allah ﷺ ordered that the butter-fat near it be thrown away and the rest of the butter-fat can be eaten.
عَنِ الدَّابَّةِ تَمُوتُ فِي الزَّيْتِ وَالسَّمْنِ وَهْوَ جَامِدٌ أَوْ غَيْرُ جَامِدٍ الْفَأْرَةِ أَوْ غَيْرِهَا قَالَ بَلَغَنَا أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ بِفَأْرَةٍ مَاتَتْ فِي سَمْنٍ فَأَمَرَ بِمَا قَرُبَ مِنْهَا فَطُرِحَ ثُمَّ أُكِلَ عَنْ حَدِيثِ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ