Imam Ahmad recorded that Ibn `Umar said, "The Messenger of Allah said:

«مَفَاتِيحُ الْغَيْبِ خَمْسٌ لَا يَعْلَمُهُنَّ إِلَّا اللهُ:

[إِنَّ اللَّهَ عِندَهُ عِلْمُ السَّاعَةِ وَيُنَزِّلُ الْغَيْثَ وَيَعْلَمُ مَا فِى الاٌّرْحَامِ وَمَا تَدْرِى نَفْسٌ مَّاذَا تَكْسِبُ غَداً وَمَا تَدْرِى نَفْسٌ بِأَىِّ أَرْضٍ تَمُوتُ إِنَّ اللَّهَ عَلَيمٌ خَبِيرٌ ]»

(The Keys of the Unseen are five, which no one knows except Allah: (Verily, Allah, with Him is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs. No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All-Knower, All-Aware.)) This was recorded only by Al-Bukhari, which he narrated in the Book of the Rain Prayer in his Sahih. He also recorded it in his Tafsir with a different chain of narrators, stating that `Abdullah bin `Umar said, "The Prophet said:

«مَفَاتِيحُ الْغَيْبِ خَمْس»

(The Keys of the Unseen are five.)'' Then he recited:

[إِنَّ اللَّهَ عِندَهُ عِلْمُ السَّاعَةِ وَيُنَزِّلُ الْغَيْثَ وَيَعْلَمُ مَا فِى الاٌّرْحَامِ]

(Verily, Allah, with Him is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs.) This too was recorded only by Al-Bukhari.