Ibn 'Abbas said:
"Should I perform Wudu' after eating food that I see in the Book of Allah is permissible because fire has touched it?" Abu Hurairah gathered some pebbles and said: "I bear witness (as many times as) the number of these pebbles, that the Messenger of Allah (ﷺ) said: 'Perform Wudu' from that which has been touched by fire.'" (DE)
English reference (DE): Vol. 1, Book 1, Hadith 174 (DE)
Arabic reference (DE): Book 1, Hadith 175 (DE)