Jami` at-Tirmidhi Book 43, Hadith 14

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.'"

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"You are suffering from a cold." (A chain to support that)

Jami` at-Tirmidhi Book 43, Hadith 13
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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