It is narrated from Hazrat Abu Ayyub Ansari (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When any one of you sneezes, he should say "Alhamdulillah ala kulli hal" (All praise is due to Allah in every circumstance). The one who replies should say "Yarhamuk Allah" (May Allah have mercy on you), and the one who sneezed should say "Yahdikum Allah wa yuslihu balakum" (May Allah guide you and set your affairs right).