The Messenger of Allah ﷺ said, "Perform ablution after eating what fire has touched."
حدثنا عبد الأعلى عن معمر عن الزهري عن خارجة بن زيد
أن رسول الله ﷺ قال توضئوا مما مست النار
Its isnad is sahih, it has already appeared at 21490 and 21540.