What to say to the disbeliever if he sneezes and praises Allah

 

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.