أَخْبَرَنَا خُشَيْشُ بْنُ أَصْرَمَ، قَالَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَخْبَرَنِي عَبْدُ الرَّحْمَنِ بْنُ بُؤْذُويَةَ، أَنَّ مَعْمَرًا، ذَكَرَهُ عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ، عَنْ مَيْمُونَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ سُئِلَ عَنِ الْفَأْرَةِ تَقَعُ فِي السَّمْنِ فَقَالَ ‏"‏ إِنْ كَانَ جَامِدًا فَأَلْقُوهَا وَمَا حَوْلَهَا وَإِنْ كَانَ مَائِعًا فَلاَ تَقْرَبُوهُ ‏"‏ ‏.‏

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) Translation Not Available

Book Ref: Sunan An Nisai Book 41 Hadith 4260
Web Ref:  Sunan An Nisai Vol 5 Book 41 Hadith 4265