(126) باب إِذَا عَطَسَ كَيْفَ يُشَمَّتُ
Narrated Abu Huraira:
The Prophet (ﷺ) said, " If anyone of you sneezes, he should say 'Al-Hamduli l-lah' (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).
Reference: Sahih al-Bukhari 6224
In-book reference: Book 78, Hadith 248
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 243