Sahih al-Bukhari, Hadith 4639 ⓘ
Narrated Sa`id Ibn Zaid: The Prophet said, "Al-Kam'a is like the Mann (sweet resin or gum) (in that it grows naturally without human care) and its water is a cure for the eye diseases."
حَدَّثَنَا مُسْلِمٌ، حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ الْمَلِكِ، عَنْ عَمْرِو بْنِ حُرَيْثٍ، عَنْ سَعِيدِ بْنِ زَيْدٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الْكَمْأَةُ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءُ الْعَيْنِ " .
also referenced under: Book 65, Hadith 4639 (In-Book) & Volume 6, Book 60, Hadith 163 (USC-MSA)