What to say to the disbeliever if he sneezes and
praises Allah
يَهْـديكُـمُ اللهُ وَيُصْـلِحُ بالَـكُم
189. Yahdeekumullaahu wa yuslihu baalakum.
May
Allah guide you and set your affairs in order
Reference: At-Tirmithi
5/82, Ahmad 4/400, Abu Dawud 4/ 308. See also Al-Albani, Sahih At-Tirmithi
2/354.