Abu Musa said, "The Jews used to sneeze in the presence of theProphet, may Allah bless him and grant him peace, hoping that he wouldsay to them, 'May Allah have mercy on you.' He used to say to them, 'MayAllah guide you and put you in order.'"
English reference: Book 40, Hadith 940
Arabic reference: Book 1, Hadith 940