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.
Sahih Muslim Book 55, Hadith 69
← Previous Hadith All the people of my Ummah would get pardon for their sins except those who publicise them. And (it means) that a servant should do a deed during the night and tell the people in the morning that he has done so and so, whereas Allah has concealed it. And he does a deed during the day and when it is night he tells the people, whereas Allah has concealed it. Zuhair has used the word hijar for publicising.

Sahih Muslim Book 55, Hadith 68 Next Hadith → This hadith has been narrated on the authority of Anas through another chain of transmitters.

Sahih Muslim Book 55, Hadith 70