What To Say When One Sneezes

Narrated Abu Huraira: The Prophet said, "If anyone of you sneezes, he should say 1. Alhamdulillah (Praise be to Allah), and his (Muslim) brother or companion should say to him, 2. Yarhamukallah (May Allah have mercy on you). When the latter says 'Yarhamukallah', the former should say, 3. Yahdikumullah Wayuslihu Baalakum (May Allah give you guidance and improve your condition)" (Bukhari)