Sayyiduna Ali (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: When any of you sneezes, he should say: "Alhamdulillahi Rabbil 'Alamin" (All praise is due to Allah, Lord of the worlds), and those around him should say: "Yarhamukallah" (May Allah have mercy on you), and then the one who sneezed should say: "Yahdikumullah wa yuslihu balakum" (May Allah guide you and set your affairs right).