Whenever the Prophet ﷺ retired to his bed each night, he would cup his hands together, blow into them, and recite into them "Say, He is Allah, the One" [Ikhlas 112:1], "Say, I seek refuge with the Lord of the daybreak" [Falaq 113:1], and "Say, I seek refuge with the Lord of mankind" [Nas 114:1]. Then he would wipe with them as much of his body as he could reach, beginning with his head, his face, and the front of his body. He would do this three times.
حدثنا قتيبة بن سعيد حدثنا المفضل بن فضالة عن عقيل عن ابن شهاب عن عروة
أن النبي ﷺ كان إذا أوى إلى فراشه كل ليلة جمع كفيه ثم نفث فيهما فقرأ فيهما قل هو الله أحد و قل أعوذ برب الفلق و قل أعوذ برب الناس ثم يمسح بهما ما استطاع من جسده يبدأ بهما على رأسه ووجهه وما أقبل من جسده يفعل ذلك ثلاث مرات