Sahih Muslim #7486 · The Book of Zuhd and Softening of Hearts

Sahih MuslimAnas b. Malik reported that two persons sneezed in the presence of Allah's Messenger
Sahih Muslim · Book 55 · The Book of Zuhd and Softening of Hearts
Sahih Muslim · كتاب 55 · كتاب الزهد
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.
حَدَّثَنِي مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا حَفْصٌ، - وَهُوَ ابْنُ غِيَاثٍ - عَنْ سُلَيْمَانَ، التَّيْمِيِّ عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ عَطَسَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم 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 ‏"‏ ‏.‏
Reference : Sahih Muslim 7486In-book reference : Book 55, Hadith 69