There are five qualities which a Muslim should display to his brother : return of salutation, response to the one who sneezes, acceptance of the invitation, paying sick visit to a patient, and accompanying the funeral.
Sunan Abi Dawud Book 43, Hadith 258
← Previous Hadith When the Messenger of Allah (ﷺ) sneezed, he placed his hand or a garment on his mouth, and lessened the noise. The transmitter Yahya is doubtful about the exact words khafada or ghadda (lessened).

Sunan Abi Dawud Book 43, Hadith 257 Next Hadith → Hilal ibn Yasar said: We were with Salim ibn Ubayd when a man from among the people sneezed and said: Peace be upon you.

Salim said: And upon you and your mother. Later he said: Perhaps you found something (annoying) in what I said to you.

He said: I wished you would not mention my mother with good or evil. He said: I have just said to you what the Messenger of Allah (ﷺ) said. We were in the presence of the Messenger of Allah (ﷺ) when a man from among the people sneezed, saying: Peace be upon you!

The Messenger of Allah (ﷺ) said: And upon you and your mother. He then said: When one of you sneezes, he should praise Allah. He further mentioned some attributes (of Allah), saying: The one who is with him should say to him: Allah have mercy on you, and he should reply to them: Allah forgive us and you.

Sunan Abi Dawud Book 43, Hadith 259