Narrated Maimuna:

The Prophet was asked about a mouse that had fallen into butter-fat (and died). He said, "Throw away the mouse and the portion of butter-fat around it, and eat the rest."

حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ، عَنْ مَيْمُونَةَ ـ رضى الله عنهم ـ قَالَتْ سُئِلَ النَّبِيُّ ﷺ عَنْ فَأْرَةٍ سَقَطَتْ فِي سَمْنٍ فَقَالَ
" أَلْقُوهَا وَمَا حَوْلَهَا وَكُلُوهُ ".