Reply when someone says yarhamukallah after sneezing
يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم
يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم
Yahdeekumul-lahu wayuslihu balakum
Translation
May Allah guide you and rectify your condition.
When to recite
Said by the sneezer in reply when someone says "yarhamukallah" to them.
Source / Reference
Al-Bukhari 7/125