Two men sneezed in the presence of the prophet (May peace be upon him). He said : Allah have mercy on you! To one and not to the other. He was asked: Messenger of Allah! Two persons sneezed. Ahmad’s version has: You invoked a blessing on one of them and left the other. He replied : This man praised Allah, and this man did not praise Allah.  

عَطَسَ رَجُلاَنِ عِنْدَ النَّبِيِّ ﷺ فَشَمَّتَ أَحَدَهُمَا وَتَرَكَ الآخَرَ قَالَ فَقِيلَ يَا رَسُولَ اللَّهِ رَجُلاَنِ عَطَسَا فَشَمَّتَّ أَحَدَهُمَا قَالَ أَحْمَدُ أَوْ فَشَمَّتَّ أَحَدَهُمَا وَتَرَكْتَ الآخَرَ فَقَالَ إِنَّ هَذَا حَمِدَ اللَّهَ وَإِنَّ هَذَا لَمْ يَحْمَدِ اللَّهَ