An-Najasat (impure and filthy things) which fall in cooking butter (ghee - which is obtained by evaporating moisture from butter) and water Sahih al-Bukhari 235
Arabic hadith text
حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ، عَنْ مَيْمُونَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم سُئِلَ عَنْ فَأْرَةٍ سَقَطَتْ فِي سَمْنٍ فَقَالَ "أَلْقُوهَا وَمَا حَوْلَهَا فَاطْرَحُوهُ. وَكُلُوا سَمْنَكُمْ "
Translation
Narrated Maimuna
Allah's Messenger (ﷺ) was asked regarding ghee (cooking butter) in which a mouse had fallen. He said, "Take out the mouse and throw away the ghee around it and use the rest."