Sahih al-Bukhari 4639
Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · Narrated by Sa`id Ibn Zaid
Arabic
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 ".
English translation
Narrated Sa`id Ibn Zaid:The Prophet (ﷺ) said, "Al-Kam'a is like the Manna (sweet resin or gum) (in that it grows naturally without human care) and its water is a cure for the eye diseases
Reference: Sahih al-Bukhari 4639, Book of Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)). English translation by Dr. Muhammad Muhsin Khan.