A mouse fell into the butter-fat and died. The Prophet ﷺ was asked about that. He said, "Throw away the mouse and the butter-fat that surrounded it, and eat the rest of the butter-fat (As-Samn).  

أَنَّ فَأْرَةً وَقَعَتْ فِي سَمْنٍ فَمَاتَتْ فَسُئِلَ النَّبِيُّ ﷺ عَنْهَا فَقَالَ أَلْقُوهَا وَمَا حَوْلَهَا وَكُلُوهُ قِيلَ لِسُفْيَانَ فَإِنَّ مَعْمَرًا يُحَدِّثُهُ عَنِ الزُّهْرِيِّ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ عَنْ أَبِي هُرَيْرَةَ قَالَ مَا سَمِعْتُ الزُّهْرِيَّ يَقُولُ إِلاَّ عَنْ عُبَيْدِ اللَّهِ عَنِ ابْنِ عَبَّاسٍ عَنْ مَيْمُونَةَ عَنِ النَّبِيِّ ﷺ وَلَقَدْ سَمِعْتُهُ مِنْهُ مِرَارًا  

[Machine] "A mouse fell into fat and died, so the Messenger of Allah ﷺ was asked and he said, 'Throw it away and eat what is around it.' Al-Humaydi said it was said to Sufyan, 'Indeed, Ma'mar narrates it to him from Az-Zuhri from Sa'id from Abu Hurairah.' Sufyan said, 'I did not hear Az-Zuhri narrating it except from 'Ubaidullah from Ibn 'Abbas from Maymunah from the Prophet ﷺ, and I have heard it multiple times.'"  

أَنَّ فَأْرَةً وَقَعَتْ فِي سَمْنٍ فَمَاتَتْ فَسُئِلَ رَسُولُ اللهِ ﷺ فَقَالَ «أَلْقُوهَا وَمَا حَوْلَهَا وَكُلُوهُ» قَالَ الْحُمَيْدِيُّ فَقِيلَ لِسُفْيَانَ فَإِنَّ مَعْمَرًا يُحَدِّثُهُ عَنِ الزُّهْرِيِّ عَنْ سَعِيدٍ عَنْ أَبِي هُرَيْرَةَ فَقَالَ سُفْيَانُ مَا سَمِعْتُ الزُّهْرِيَّ يُحَدِّثُهُ إِلَّا عَنْ عُبَيْدِ اللهِ عَنِ ابْنِ عَبَّاسٍ عَنْ مَيْمُونَةَ عَنِ النَّبِيِّ ﷺ سَمِعَتْ مِنْهُ مِرَارًا