Sahih Al Bukhari 1: Chapter 3, Hadith 115

(115) The knowledge and its teaching and preaching at night

حَدَّثَنَا صَدَقَةُ، ‏‏‏‏‏‏أَخْبَرَنَا ابْنُ عُيَيْنَةَ، ‏‏‏‏‏‏عَنْ مَعْمَرٍ، ‏‏‏‏‏‏عَنِ الزُّهْرِيِّ، ‏‏‏‏‏‏عَنْ هِنْدٍ، ‏‏‏‏‏‏عَنْ أُمِّ سَلَمَة، ‏‏‏‏‏‏وَعَمْرٍو، ‏‏‏‏‏‏وَيَحْيَى بْنِ سَعِيدٍ، ‏‏‏‏‏‏عَنِ الزُّهْرِيِّ، ‏‏‏‏‏‏عَنْ هِنْدٍ، ‏‏‏‏‏‏عَنْ أُمِّ سَلَمَةَ، ‏‏‏‏‏‏قَالَتْ:‏‏‏‏ اسْتَيْقَظَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ذَاتَ لَيْلَةٍ، ‏‏‏‏‏‏فَقَالَ:‏‏‏‏ "سُبْحَانَ اللَّهِ، ‏‏‏‏‏‏مَاذَا أُنْزِلَ اللَّيْلَةَ مِنَ الْفِتَنِ، ‏‏‏‏‏‏وَمَاذَا فُتِحَ مِنَ الْخَزَائِنِ، ‏‏‏‏‏‏أَيْقِظُوا صَوَاحِبَاتِ الْحُجَرِ، ‏‏‏‏‏‏فَرُبَّ كَاسِيَةٍ فِي الدُّنْيَا عَارِيَةٍ فِي الْآخِرَةِ".

SAHIH HADITH:

Narrated Um Salama: One night Allah's Apostle got up and said, Subhan Allah! How many afflictions have been descended tonight and how many treasures have been disclosed! Go and wake the sleeping lady occupants of these dwellings (his wives) up (for prayers). A well-dressed (soul) in this world may be naked in the Hereafter.

REFERENCE:

Sahih Al Bukhari 1: Chapter 3, Hadith 115