الْحَمْدُ لِلَّهِ
Transliteration
Alhamdu lillah
English meaning
All praise is for Allah.
When is it recited?
Said when sneezing. Others respond with 'Yarhamukallah' (May Allah have mercy on you). The sneezer replies: 'Yahdikumullah wa yuslihu balakum' (May Allah guide you and rectify your affairs).
Source
Bukhari, Adab 125, 6224