Sahih Muslim 352
Sahih Muslim · Book 3: The Book of Menstruation · Performing wudu’ after eating something that has been touched by fire
'Abdullah b. Ibrahim b. Qariz reported that he found Abu Huraira performing ablution in the mosque, who said:
قَالَ ابْنُ شِهَابٍ أَخْبَرَنِي عُمَرُ بْنُ عَبْدِ الْعَزِيزِ ، أَنَّ عَبْدَ اللَّهِ بْنَ إِبْرَاهِيمَ بْنِ قَارِظٍ ، أَخْبَرَهُ أَنَّهُ، وَجَدَ أَبَا هُرَيْرَةَ يَتَوَضَّأُ عَلَى الْمَسْجِدِ فَقَالَ إِنَّمَا أَتَوَضَّأُ مِنْ أَثْوَارِ أَقِطٍ أَكَلْتُهَا لأَنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " تَوَضَّئُوا مِمَّا مَسَّتِ النَّارُ " .
I am performing ablution because of having eaten pieces of cheese, for I heard the Messenger of Allah (ﷺ) say: Perform ablution (after eating anything) touched by fire.