Invocation for sneezing
188. When you
sneeze , then say:
الْحَمْـدُ للهِ.
Alhamdu lillaah
All
praises and thanks are to Allah.
Your companion should
say:
يَرْحَمُـكَ الله
Yarhamukallaah
May
Allah have mercy upon you.
When someone says
Yarhamukallaah to you then you should say:
يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم
Yahdeekumul-laahu wa
yuslihu baalakum.
May
Allah guide you and set your affairs in order.
Reference: Al-Bukhari
7/125.