Abu Sa'id reported that the Prophet, may Allah bless him and grant him peace, 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