RESPONSE TO THE ONE WHOSNEEZED H 892 "When you sneeze you should say, 'Praise be to Allah' and your brother or companion should respond with, 'May Allah have mercy on you,' to which he should reply, 'May Allah guide you and improve your condition.'" R 892 Bukhari - Abu Hurairah who related that the Prophet, praise and peace be upon him, said this.
879- وعنه ، عن النبيِّ صلى الله عليه وآله وسلم ، قَالَ : "إِذَا عَطَسَ أحَدُكُمْ فَلْيَقُلْ : الحَمْدُ للهِ ، وَلْيَقُلْ لَهُ أخُوهُ أَوْ صَاحِبُهُ : يَرْحَمُكَ الله . فإذَا قَالَ لَهُ : يَرْحَمُكَ اللهُ ، فَليَقُلْ : يَهْدِيكُمُ اللهُ وَيُصْلِحُ بَالَكُمْ" رواه البخاري .