Sahih al-Bukhari 4881
Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · Narrated by Abu Huraira
Arabic
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ يَبْلُغُ بِهِ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِنَّ فِي الْجَنَّةِ شَجَرَةً يَسِيرُ الرَّاكِبُ فِي ظِلِّهَا مِائَةَ عَامٍ لاَ يَقْطَعُهَا، وَاقْرَءُوا إِنْ شِئْتُمْ {وَظِلٍّ مَمْدُودٍ}".
English translation
Narrated Abu Huraira:The Prophet (ﷺ) said, "In Paradise there is a tree which is so big that a rider can travel in its shade for one hundred years without passing it; and if you wish, you can recite: 'In shade long extended
Reference: Sahih al-Bukhari 4881, Book of Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)). English translation by Dr. Muhammad Muhsin Khan.