The Prophet ﷺ said, "Allah loves sneezing but dislikes yawning; so if anyone of you sneezes and then praises Allah, every Muslim who hears him (praising Allah) has to say Tashmit to him. But as regards yawning, it is from Satan, so if one of you yawns, he should try his best to stop it, for when anyone of you yawns, Satan laughs at him." (Using translation from Bukhārī 6226)   

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ اللهَ تَعَالَى يُحِبُّ الْعُطَاسَ وَيَكْرَهُ التَّثَاؤُبَ فَإِذَا عَطَسَ أَحَدُكُمْ وَحَمِدَ اللهَ كَانَ حَقًّا عَلَى كُلِّ مُسْلِمٍ يَسْمَعُهُ أَنْ يَقُولَ يَرْحَمُكَ اللهُ وَأَمَّا التَّثَاؤُبُ فَإِنَّمَا هُوَ مِنَ الشَّيْطَانِ فَإِذَا تَثَاوَبَ أَحَدُكُمْ فَلْيَرُدَّ مَا اسْتَطَاعَ فَإِنَّ أَحَدَكُمْ إِذَا قَالَ هَاهْ ضَحِكَ الشَّيْطَانُ مِنْهُ  

The yawning as from the devil. So when one of you yawns he should try to restrain it as far as it lies in his power. (Using translation from Muslim 2994)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ التَّثَاؤُبُ مِنَ الشَّيْطَانِ فَإِذَا تَثَاوَبَ أَحَدُكُمْ فَلْيَكْظِمْ مَا اسْتَطَاعَ  

[Machine] From the Messenger of Allah ﷺ , he said: "When one of you yawns during prayer, let him suppress it as much as he can, for indeed, the devil enters..."  

عَنْ رَسُولِ اللهِ ﷺ قَالَ إِذَا تَثَاوَبَ أَحَدُكُمْ فِي الصَّلَاةِ فَلْيَكْظِمْ مَا اسْتَطَاعَ فَإِنَّ الشَّيْطَانَ يَدْخُلُ