Sahih al-Bukhari 4433
In-book no 4433حَدَّثَنَا 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 ".
Narrated Sa`id Ibn Zaid: The Prophet (ﷺ) 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."