Answer: "Alhamdulillāh" (praise be to Allah).

His brother or his companion should say to him: "Yarhamukallāh" (may Allah have mercy on you).

The sneezer should, then, reply saying: "Yahdīkumullāh wa yuslih bālakum" (may Allah guide you and improve your condition). [Narrated by Al-Bukhāri]