Sahih al-Bukhari 4778
Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا يَحْيَى بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنِي ابْنُ وَهْبٍ، قَالَ حَدَّثَنِي عُمَرُ بْنُ مُحَمَّدِ بْنِ زَيْدِ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ أَبَاهُ، حَدَّثَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ قَالَ قَالَ النَّبِيُّ ـ صلى الله عليه وسلم ـ " مَفَاتِيحُ الْغَيْبِ خَمْسٌ " ثُمَّ قَرَأَ {إِنَّ اللَّهَ عِنْدَهُ عِلْمُ السَّاعَةِ}.
English translation
Narrated `Abdullah bin `Umar:The Prophet (ﷺ) said, "The keys of the Unseen are five." And then he recited: 'Verily, the knowledge of the Hour is with Allah (alone)
Reference: Sahih al-Bukhari 4778, Book of Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)). English translation by Dr. Muhammad Muhsin Khan.