Sahih
حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى، حَدَّثَنَا ابْنُ وَهْبٍ، أَنْبَأَنَا يُونُسُ بْنُ يَزِيدَ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " تَوَضَّئُوا مِمَّا مَسَّتِ النَّارُ " .
It was narrated that 'Aishah said:"The Messenger of Allah said: 'Perform ablution after (eating) that which has been changed by fire