Hadith 6

Sahih Bukhari

Book 19: Prayer at Night (Tahajjud)

Chapter 5

The Prophet's (pbuh) exhorting to Tahajjud and Nawafil without making them compulsory

باب تَحْرِيضِ النَّبِيِّ صلى الله عليه وسلم عَلَى صَلاَةِ اللَّيْلِ وَالنَّوَافِلِ مِنْ غَيْرِ إِيجَابٍ

The Prophet ﷺ went to ‘Ali and Fatima رضي الله عنهما at night and knocked their door to exhort them to perform Salat (i.e. night prayers). ​​
وَطَرَقَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَاطِمَةَ وَعَلِيًّا- عليهما السلام- لَيْلَةً لِلصَّلاَةِ.
Sahih al-Bukhari 1126
حَدَّثَنَا ابْنُ مُقَاتِلٍ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ هِنْدٍ بِنْتِ الْحَارِثِ، عَنْ أُمِّ سَلَمَةَ ـ رضى الله عنها ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم اسْتَيْقَظَ لَيْلَةً فَقَالَ ‏ ‏‏.‏
"‏ سُبْحَانَ اللَّهِ مَاذَا أُنْزِلَ اللَّيْلَةَ مِنَ الْفِتْنَةِ، مَاذَا أُنْزِلَ مِنَ الْخَزَائِنِ مَنْ يُوقِظُ صَوَاحِبَ الْحُجُرَاتِ، يَا رُبَّ كَاسِيَةٍ فِي الدُّنْيَا عَارِيَةٍ فِي الآخِرَةِ ‏"
Um Salama:

One night the Prophet (ﷺ) got up and said, "Subhan Allah! How many afflictions Allah has revealed tonight and how many treasures have been sent down (disclosed). Go and wake the sleeping lady occupants of these dwellings up (for prayers), perhaps a well dressed in this world may be naked in the Hereafter."