77. Invocation for sneezing

Dua 190

الْحَمْـدُ للهِ -يَرْحَمُـكَ الله -يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم

Alhamdu lillaah
Yahdeekumul-laahu wa yuslihu baalakum.

When you sneeze , then say : All praises and thanks are to Allah.
Your companion should say : May Allah have mercy upon you .
When someone says Yarhamukallaah to you then you should say: May Allah guide you and set your affairs in order.

Reference: Al-Bukhari 7/125.