Reference : Hisn al-Muslim 189

يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم
Yahdīkumullāhu wa yuṣliḥu bālakum.

May Allah guide you and set your affairs in order

Reference:
At-Tirmidhi 5/82, Ahmad 4/400, Abu Dawud 4/ 308. See also Al-Albani, Sahih 
At-Tirmidhi 2/354.

Chapter: When a disbeliever praises Allah after sneezing