Sahih al-Bukhari 6319
Sahih al-Bukhari · Book 80: Invocations · Taking refuge with Allah, and the recitation before going to bed
Narrated `Aisha:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ ، حَدَّثَنَا اللَّيْثُ ، قَالَ حَدَّثَنِي عُقَيْلٌ ، عَنِ ابْنِ شِهَابٍ ، أَخْبَرَنِي عُرْوَةُ ، عَنْ عَائِشَةَ ـ رضى الله عنها أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا أَخَذَ مَضْجَعَهُ نَفَثَ فِي يَدَيْهِ، وَقَرَأَ بِالْمُعَوِّذَاتِ، وَمَسَحَ بِهِمَا جَسَدَهُ.
Whenever Allah's Messenger (ﷺ) went to bed, he used to blow on his hands while reciting the Mu'auwidhat ( i.e. Suratal-Falaq 113 and Surat-an-Nas 114) and then pass his hands over his body.