"I heard the Messenger of Allah ﷺ say: 'Perform Wudu' from that which has been touched by fire.'" (Using translation from Nasāʾī 171)

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ تَوَضَّئُوا مِمَّا غَيَّرَتِ النَّارُ لَوْنَهُ