Invocation for sneezing

1. إِذَا عَطَسَ أَحَدُكُمْ فَلْيَقُلْ: (الحَمْدُ لِلَّهِ)، وَلْيَقُلْ لَهُ أَخُوهُ أَوْ صَاحِبُهُ: (يَرْحَمُكَ اللَّهُ)، فَإِذَا قَالَ لَهُ: (يَرْحَمُكَ اللَّهُ)، فَلْيَقُلْ: (يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمُ)

   (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.))

Fortress of the Muslim (Hisn al-Muslim), Sa'id al-Qahtani.