Abu Sa'id reported that the Prophet ﷺ said, "When one of you yawns, he should put his hand over his mouth. Otherwise Shaytan might enter it."
عَنِ النَّبِيِّ ﷺ قَالَ إِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَضَعْ يَدَهُ بِفِيهِ فَإِنَّ الشَّيْطَانَ يَدْخُلُ فِيهِ
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When one of you yawns, he should hold his hand over his mouth, for the devil enters.
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيُمْسِكْ عَلَى فِيهِ فَإِنَّ الشَّيْطَانَ يَدْخُلُ
“When anyone of you yawns, let him put his hand over his mouth and not make a sound, because Satan laughs at him.”
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَضَعْ يَدَهُ عَلَى فِيهِ وَلاَ يَعْوِي فَإِنَّ الشَّيْطَانَ يَضْحَكُ مِنْهُ