Hadith 212
“the Prophet (ﷺ) said, "There are four things that one Muslim owes another Muslim: to visit him when he is ill, to be with him when he dies, to accept when he invites him, and to ask for mercy on him when he sneezes.”
Ibn Mas'ud (رضي الله عنه)Al-Adab Al-Mufrad 923Adab of Sneezing and Yawning