Sahih Bukhari Volume 008, Book 073, Hadith Number 243.

Narated By Abu Huraira : The Prophet said, " 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-lah wa Yuslih balakum' (May Allah give you guidance and improve your condition)."

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