that when the Prophet (ﷺ) would sneeze, he would cover his face with his hand or with his garment, and muffle the sound with it.
Jami` at-Tirmidhi Book 43, Hadith 15
← Previous Hadith from his mother, from her father, who said: "The Messenger of Allah (ﷺ) said: 'Reply three times to the sneezing person. If he (sneezes) more, then if you wish reply and if you do not then do not.'"

Jami` at-Tirmidhi Book 43, Hadith 14 Next Hadith → that the Messenger of Allah (ﷺ) said: "The sneeze is from Allah and the yawn is from Ash-Shaitan. So when one of you yawns let him cover his mouth with his hand. For when he says 'Ah, Ah' Ash-Shaitan laughs from inside his opening."

Jami` at-Tirmidhi Book 43, Hadith 16