"Truffles are the earth's smallpox." So the Messenger of Allah ﷺ said: "Truffles are a form of manna, and its liquid is a cure for the eye. Al-'Ajwah is from Paradise, and it contains a cure for poison." (Using translation from Tirmidhī 2068)   

أَنَّ رَسُولَ اللهِ ﷺ خَرَجَ عَلَيْهِمْ وَهُمْ يَذْكُرُونَ الْكَمْأَةَ وَبَعْضُهُمْ يَقُولُ جُدَرِيُّ الْأَرْضِ فَقَالَ رَسُولُ اللهِ ﷺ «الْكَمْأَةُ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءٌ لِلْعَيْنِ وَالْعَجْوَةُ مِنَ الْجَنَّةِ وَهِيَ شِفَاءٌ مِنَ السُّمِّ»  

[Machine] "The kam'ah is from manna, and its water is a remedy for the eye. The 'ajwah is from Jannah (paradise), and it is a cure for poison." [234] 6638 and from Muhammad ibn Bashshar, from Mu'adh ibn Hisham, from his father, from Qatadah, and from Muhammad ibn Bashshar, from Abu 'Abdus-Samad 'Abdul-'Aziz ibn 'Abdillah ibn 'Abdus-Samad, from Matar al-Warraq - both of them are Qatadah and Matar - on the authority of Shahir ibn Hawshab with it.  

«الْكَمْأَةُ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءٌ لِلْعَيْنِ وَالْعَجْوَةُ مِنَ الْجَنَّةِ وَهِيَ شِفَاءٌ مِنَ السُّمِّ» [234] 6638 وَعَنْ مُحَمَّدِ بْنِ بَشَّارٍ عَنْ مُعَاذِ بْنِ هِشَامٍ عَنْ أَبِيهِ عَنْ قَتَادَةَ وَعَنْ مُحَمَّدِ بْنِ بَشَّارٍ عَنْ أَبِي عَبْدِ الصَّمَدِ عَبْدِ الْعَزِيزِ بْنِ عَبْدِ الصَّمَدِ عَنْ مَطَرٍ الْوَرَّاقِ كِلَاهُمَا قَتَادَةُ وَمَطَرٌ عَنْ شَهْرِ بْنِ حَوْشَبٍ بِهِ  

Messenger of Allah ﷺ said, "The Kam'a (i.e. a kind of edible fungus) is like the Manna (in that it is obtained without effort) and its water is a (medicine) cure for eye trouble." (Using translation from Bukhārī 4478)   

أَنَّ النَّبِيَّ ﷺ قَالَ «الْكَمْأَةُ بَقِيَتْ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءُ الْعَيْنِ»