Abu Salih reported that the Prophet, may Allah bless him and grant
him peace, said, "When one of you sneezes, he should say, 'Praise be to
Allah.' When he says, 'Praise be to Allah, ' his brother or companion should
say to him, 'May Allah have mercy on you.' Then let the person who sneezed
say, 'May Allah guide you and put your affairs in order.'"
'Ali said, "When someone hears a sneeze and says, 'Praise be to
Allah, Lord of the Worlds, in every situation,' he will never get a toothache
or earache."
Abu Hurayra reported that the Prophet, may Allah bless him and
grant him peace, said, "Allah loves the sneeze and dislikes yawning. When
one you sneezes and praises Allah, it is a duty for every Muslim who hears
him to say, 'May Allah have mercy on you.;' As for the yawn, it comes from
Shaytan. When one of you yawns, he should repress it as much as possible.
When one of you yawns, Shaytan laughs at him."
Abu Hurayra reported that the Messenger of Allah, may Allah bless
him and grant him peace, said, "A Muslim owes another Muslim six duties."
He was asked, "And what are they, Messenger of Allah?" He said, "To greet
him when he meets him, to accept when he gives him an invitation, to give
him good counsel when he asks for advice, to wish mercy on him when he
sneezes and says, 'Praise be to Allah,' to visit him when he is ill, and
to join the funeral procession when he dies."
