كتاب الطهارة
2  
The Book of Purification
(15)
Chapter: Siwak (tooth-stick)
(15)
باب السِّوَاكِ ‏‏
Sahih Muslim 256

Ibn 'Abbas reported that he spent a night at the house of the Messenger of Allah (ﷺ), The Apostle of Allah (way peace be upon him) got up for prayer in the latter part of the night. He went out and looked towards the sky and then recited this verse (190th) of AI-i-'Imran:

" Verily in the creation of the heavens and the earth and the alternation of night and day." up to the (words)" save us from the torment of Hell." He then returned to his house, used the tooth-stick, performed the ablution, and then got up and offered the prayer. He than lay down on the bed. and again got up and went out and looked towards the sky and recited this verse (mentioned above), then returned, used the tooth-stick, performed ablution and again offered the prayer.
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ مُسْلِمٍ، حَدَّثَنَا أَبُو الْمُتَوَكِّلِ، أَنَّ ابْنَ عَبَّاسٍ، حَدَّثَهُ أَنَّهُ، بَاتَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ فَقَامَ نَبِيُّ اللَّهِ صلى الله عليه وسلم مِنْ آخِرِ اللَّيْلِ فَخَرَجَ فَنَظَرَ فِي السَّمَاءِ ثُمَّ تَلاَ هَذِهِ الآيَةَ فِي آلِ عِمْرَانَ ‏{‏ إِنَّ فِي خَلْقِ السَّمَوَاتِ وَالأَرْضِ وَاخْتِلاَفِ اللَّيْلِ وَالنَّهَارِ‏}‏ حَتَّى بَلَغَ ‏{‏ فَقِنَا عَذَابَ النَّارِ‏}‏ ثُمَّ رَجَعَ إِلَى الْبَيْتِ فَتَسَوَّكَ وَتَوَضَّأَ ثُمَّ قَامَ فَصَلَّى ثُمَّ اضْطَجَعَ ثُمَّ قَامَ فَخَرَجَ فَنَظَرَ إِلَى السَّمَاءِ فَتَلاَ هَذِهِ الآيَةَ ثُمَّ رَجَعَ فَتَسَوَّكَ فَتَوَضَّأَ ثُمَّ قَامَ فَصَلَّى ‏.‏
Reference : Sahih Muslim 256
In-book reference : Book 2, Hadith 63
USC-MSA web (English) reference : Book 2, Hadith 494
  (deprecated numbering scheme)