Authentic hadithNarrated by Bukhari & Muslim
If any of you wakes up from his sleep, let him blow water out of his nose three times, as the devil spends the night on his nostrils
عَنْ أَبِي هُرَيْرَةَ رضي الله عنه أَنَّ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا اسْتَيْقَظَ أَحَدُكُمْ مِنْ مَنَامِهِ فَلْيَسْتَنْثِرْ ثَلَاثَ مَرَّاتٍ، فَإِنَّ الشَّيْطَانَ يَبِيتُ عَلَى خَيَاشِيمِهِ».
Explanation
The Prophet (may Allah's peace and blessings be upon him) urges anyone who wakes up from his sleep to make Istinthar, i.e., blowing water out of the nose after sniffing it, three times because the devil spends the night on the nostril, which is the whole nose.
Source
صحيح البخاري (4/ 126) (3295).
صحيح مسلم (1/ 212) (238).
توضيح الأحكام، للشيخ للبسام (1/ 211).
سُبل السلام، للصنعاني (1/ 64).
فتح ذي الجلال والإكرام بشرح بلوغ المرام، لابن عثيمين (1/ 179).
منحة العلَّام، لعبد الله الفوزان (1/ 166).
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