Volume 8, Book 73, Number 243:
Narrated 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).”
Volume 8 – 1386 / 1700
SAHIH BUKHARI VOLUME 8 > BOOK 73: GOOD MANNERS AND FORM (AL-ADAB)