So and so sneezed and you said: May Allah have mercy upon you. I also sneezed but you did not utter these words for me. Thereupon he (the Holy Prophet) said: That person praised Allah, and you did not praise Allah.  

عَطَسَ عِنْدَ النَّبِيِّ ﷺ رَجُلاَنِ فَشَمَّتَ أَحَدَهُمَا وَلَمْ يُشَمِّتِ الآخَرَ فَقَالَ الَّذِي لَمْ يُشَمِّتْهُ عَطَسَ فُلاَنٌ فَشَمَّتَّهُ وَعَطَسْتُ أَنَا فَلَمْ تُشَمِّتْنِي قَالَ إِنَّ هَذَا حَمِدَ اللَّهَ وَإِنَّكَ لَمْ تَحْمَدِ اللَّهَ  

This hadith has been narrated on the authority of Anas through another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ بِمِثْلِهِ  

I visited Abu Musa, as he was in the house of the daughter of Fadl b. 'Abbas. I sneezed but he did not respond to it (by saying): Allah may have mercy upon you. Then she sneezed and he (Fadl b. 'Abbas) said: May Allah have mercy upon you. I came back to my mother and informed her about it, and when he came to her she said: My son sneezed in your presence and you did not say:" Allah may have mercy upon you, and she sneezed and you said for her:" May Allah have mercy upon you." Thereupon he said: Your son sneezed but he did not praise Allah and I did not beg mercy of Allah for him and she sneezed and she praised Allah and so I said: May Allah have mercy upon you, as I heard Messenger of Allah ﷺ as saying: When any one of you sneezes he should praise Allah and the other should say: May Allah have mercy upon you, and if he does not praise Allah, no mercy should be begged for him.  

عَطَسَ عِنْدَكَ ابْنِي فَلَمْ تُشَمِّتْهُ وَعَطَسَتْ فَشَمَّتَّهَا فَقَالَ إِنَّ ابْنَكِ عَطَسَ فَلَمْ يَحْمَدِ اللَّهَ فَلَمْ أُشَمِّتْهُ وَعَطَسَتْ فَحَمِدَتِ اللَّهَ فَشَمَّتُّهَا سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا عَطَسَ أَحَدُكُمْ فَحَمِدَ اللَّهَ فَشَمِّتُوهُ فَإِنْ لَمْ يَحْمَدِ اللَّهَ فَلاَ تُشَمِّتُوهُ  

A person sneezed in his presence and he said to him: May Allah have mercy upon you. And he then sneezed for the second time and Messenger of Allah ﷺ said to him: He is suffering from cold (and no response is necessary).  

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ وَعَطَسَ رَجُلٌ عِنْدَهُ فَقَالَ لَهُ يَرْحَمُكَ اللَّهُ ثُمَّ عَطَسَ أُخْرَى فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ الرَّجُلُ مَزْكُومٌ  

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.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ التَّثَاؤُبُ مِنَ الشَّيْطَانِ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَكْظِمْ مَا اسْتَطَاعَ  

When one of you yawns, he should keep his mouth shut with the help of his hand, for it is the devil that enters therein.  

سَمِعْتُ ابْنًا لأَبِي سَعِيدٍ الْخُدْرِيِّ يُحَدِّثُ أَبِي عَنْ أَبِيهِ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ إِذَا تَثَاوَبَ أَحَدُكُمْ فَلْيُمْسِكْ بِيَدِهِ عَلَى فِيهِ فَإِنَّ الشَّيْطَانَ يَدْخُلُ  

When one of you yawns, he should try to restrain it with cue help of his hand since it is the Satan that enters therein.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا تَثَاوَبَ أَحَدُكُمْ فَلْيُمْسِكْ بِيَدِهِ فَإِنَّ الشَّيْطَانَ يَدْخُلُ  

The son of Abu Said al-Khudri reported on the authority of his father that Messenger of Allah ﷺ said. When one of you yawns while engaged in prayer, he should try to restrain so far as it lies in his power, since it is the Satan that enter therein.  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا تَثَاوَبَ أَحَدُكُمْ فِي الصَّلاَةِ فَلْيَكْظِمْ مَا اسْتَطَاعَ فَإِنَّ الشَّيْطَانَ يَدْخُلُ  

Abu Said al-Khudri reported Messenger of Allah ﷺ a hadith like this through another chain of transmitters.  

قَالَ رَسُولُ اللَّهِ ﷺ بِمِثْلِ حَدِيثِ بِشْرٍ وَعَبْدِ الْعَزِيزِ