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  

The tradition mentioned above has also been transmitted in a similar way by Suhail through a different chain of narrators. This version has; “during prayer, so he should hold as far as possible”.  

فِي الصَّلاَةِ فَلْيَكْظِمْ مَا اسْتَطَاعَ  

Allah likes sneezing but dislikes yawning. So when one of you yawns, he should restrain it as much as possible, and should not say Ha, Ha, for that is from the devil who laughs at him.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ يُحِبُّ الْعُطَاسَ وَيَكْرَهُ التَّثَاؤُبَ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَرُدَّهُ مَا اسْتَطَاعَ وَلاَ يَقُلْ هَاهْ هَاهْ فَإِنَّمَا ذَلِكُمْ مِنَ الشَّيْطَانِ يَضْحَكُ مِنْهُ