Every night, when the Prophet ﷺ would go to his bed, he would join his hands, then blow in them, as he recited in them: “Say: He is Allah, the One.” And “Say: I seek refuge in the Lord of Al-Falaq” and “Say: I seek refuge in the Lord of mankind.” Then he would wipe as much as he was able to of his body with them, beginning with them first of his head and face, and the front of his body. He would do this three times.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا أَوَى إِلَى فِرَاشِهِ كُلَّ لَيْلَةٍ جَمَعَ كَفَّيْهِ ثُمَّ نَفَثَ فِيهِمَا فَقَرَأَ فِيهِمَا ( قلْ هُوَ اللَّهُ أَحَدٌ ) وَ ( قلْ أَعُوذُ بِرَبِّ الْفَلَقِ ) وَ ( قلْ أَعُوذُ بِرَبِّ النَّاسِ ) ثُمَّ يَمْسَحُ بِهِمَا مَا اسْتَطَاعَ مِنْ جَسَدِهِ يَبْدَأُ بِهِمَا عَلَى رَأْسِهِ وَوَجْهِهِ وَمَا أَقْبَلَ مِنْ جَسَدِهِ يَفْعَلُ ذَلِكَ ثَلاَثَ مَرَّاتٍ