Authentic hadithNarrated by Muslim
When any of you yawns, let him put his hand over his mouth, for indeed, the devil enters
عَن أَبِي سَعِيدٍ الْخُدْرِيِّ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «إِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيُمْسِكْ بِيَدِهِ عَلَى فِيهِ، فَإِنَّ الشَّيْطَانَ يَدْخُلُ».
Explanation
The Prophet (may Allah's peace and blessings be upon him) instructed anyone who yawns, opening his mouth due to laziness, fullness, or similar reasons, to place his hand over his mouth to close it. This is because the devil enters if the mouth is left open, and placing the hand prevents him from entering.
Source
صحيح مسلم (4/ 2293) (2995).
بهجة الناظرين شرح رياض الصالحين، لسليم الهلالي (2/ 151).
شرح رياض الصالحين، لابن عثيمين (4/ 436).
تطريز رياض الصالحين، لفيصل آل مبارك (ص529).
نزهة المتقين شرح رياض الصالحين، مجموعة من الباحثين (1/ 679).
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