Sunan Ibn Majah, Volume 4, Book 31, Hadith 3455 (DarusSalam) ⓘ

It was narrated that Abu Hurairah said: “We used to narrate from the Messenger of Allah and mention truffles, and they said: ‘(It is) the smallpox of the earth.’ When the Messenger of Allah 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.’”

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا أَبُو عَبْدِ الصَّمَدِ، حَدَّثَنَا مَطَرٌ الْوَرَّاقُ، عَنْ شَهْرِ بْنِ حَوْشَبٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ كُنَّا نَتَحَدَّثُ عِنْدَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَذَكَرْنَا الْكَمْأَةَ فَقَالُوا هِيَ جُدَرِيُّ الأَرْضِ ‏.‏ فَنُمِيَ الْحَدِيثُ إِلَى رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَقَالَ ‏ "‏ الْكَمْأَةُ مِنَ الْمَنِّ وَالْعَجْوَةُ مِنَ الْجَنَّةِ وَهِيَ شِفَاءٌ مِنَ السَّمِّ ‏" ‏ ‏.‏