Islam

Nabi' s.a.w. said that, "If anyone of you sneezes, he should say 'Al-Hamdulillah' (Praise be to Allah), and his (Muslim) brother or companion should say to him, 'Yar-hamuka-l-lah' (May Allah bestow his Mercy on you). When the latter says 'Yar-hamuka-llah", the former should say, 'Yahdikumul-lahwa Yuslih balakum' (May Allah give you guidance and improve your condition)."Sahih Bukhari, Volume 8, Book 73, Number 243/