465. How many times do you have to respond to sneezing?
Narrated Abu Huraira (RA): I heard the Messenger of Allah (ﷺ), say, "If one of you sneezes, the person next to him should say, 'Yarhamukallah'; "If you sneeze more than three times, you will understand that he has a cold. So you don't have to say 'Yarhamukallah' after three times.”
ReferenceSahih (Albani). Silsilah Sahihah: 1330
Related Duas:
Manners in sneezing
Spread of salutations
Dua for the praiser
Etiquette in yawn
What is said to a kaafir when he sneezes
Dua at the end of a sitting/gathering [Kaffaratul Majlis]
To one who has offered you some of his wealth
Upon receiving pleasing news
Dua upon sneezing #1
Prostration due to Quran recitation
Dua said at a sitting or gathering etc
Dua upon sneezing #2