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((إِذَا عَطَسَ أَحَدُكُم فَلْيَقُلِ الْحَمْدُ لِلَّهِ، وَلْيَقُلْ لَهُ أَخُوهُ أَوْ صَاحِبُهُ: يَرْحَمُكَ اللَّهُ، فَإِذَا قَالَ لَهُ: يَرحَمُكَ اللَّهُ، فَلْيَقُلْ: يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ)).
When one of you sneezes he should say:(Alhamdu lillah.) and his brother or companion should say to him: (Yarhamukal-lah.) and he (i.e. the one who sneezed) replies back to him:(Yahdeekumul-lahu wayuslihu balakum.)
When one of you sneezes he should say:(All praise if for Allah.) and his brother or companion should say to him: (May Allah have mercy upon you.) and he (i.e. the one who sneezed) replies back to him:(May Allah guide you and rectify your condition.)
onceText: Hisn al-Muslim by Sa‘id ibn ‘Ali ibn Wahf al-Qahtani, via hisnmuslim.com.