that the Messenger of Allah ﷺ said: "The sneeze is from Allah and the yawn is from Ash-Shaitan. So when one of you yawns let him cover his mouth with his hand. For when he says 'Ah, Ah' Ash-Shaitan laughs from inside his opening." [And indeed Allah loves the sneeze and He dislikes the Yawn, so when a man says Ah, Ah when yawning, indeed Ash-Shaitan laughs from inside his opening."]  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ الْعُطَاسُ مِنَ اللَّهِ وَالتَّثَاؤُبُ مِنَ الشَّيْطَانِ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَضَعْ يَدَهُ عَلَى فِيهِ وَإِذَا قَالَ آهْ آهْ فَإِنَّ الشَّيْطَانَ يَضْحَكُ مِنْ جَوْفِهِ وَإِنَّ اللَّهَ يُحِبُّ الْعُطَاسَ وَيَكْرَهُ التَّثَاؤُبَ فَإِذَا قَالَ الرَّجُلُ آهْ آهْ إِذَا تَثَاءَبَ فَإِنَّ الشَّيْطَانَ يَضْحَكُ فِي جَوْفِهِ  

that the Messenger of Allah ﷺ said: "Indeed Allah loves sneezing and He dislikes the yawn. So when one of you sneezes and says 'Al-Hamdulillah (All praise is due to Allah),' then it is a right due from every one who hears him to say: 'Yarhamukallah (May Allah have mercy upon you)' As for yawning then when one of you yawns let him suppress it as much as possible and not say: "Hah Hah' for that is only from Ash-Shaitan laughing at him."  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ يُحِبُّ الْعُطَاسَ وَيَكْرَهُ التَّثَاؤُبَ فَإِذَا عَطَسَ أَحَدُكُمْ فَقَالَ الْحَمْدُ لِلَّهِ فَحَقٌّ عَلَى كُلِّ مَنْ سَمِعَهُ أَنْ يَقُولَ يَرْحَمُكَ اللَّهُ وَأَمَّا التَّثَاؤُبُ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَرُدَّهُ مَا اسْتَطَاعَ وَلاَ يَقُولَنَّ هَاهْ هَاهْ فَإِنَّمَا ذَلِكَ مِنَ الشَّيْطَانِ يَضْحَكُ مِنْهُ