It was narrated that Abu Hurairah said:“We used to narrate from the Messenger of Allah (ﷺ) and mention truffles, and they said: ‘(It is) the smallpox of the earth.’ When the Messenger of Allah (ﷺ) was told of what they were saying: he said: ‘Truffles are a type of manna, and the Ajwah are from Paradise, and they are a healing from poison.’”

English translation · Sunan Ibn Majah