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.’”

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