When one of you sneezes, he should say: "Praise be to Allah in every circumstance," and his brother or his companion should say: "May Allah have mercy on you!" And he should then reply: "May Allah guide you and set right your affairs."
Reference: Sunan Abi Dawud 5033 In-book : Book 43, Hadith 261 English translation : Book 42, Hadith 5015
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