Narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that two persons sneezed in the presence of the Messenger of Allah (peace and blessings of Allah be upon him). The Prophet (peace be upon him) replied to one of them with "Yarhamuk Allah" (may Allah have mercy on you), but did not say anything to the other. It was asked of the Prophet (peace be upon him) why he said "Yarhamuk Allah" to one and not to the other. The Noble Prophet (peace be upon him) replied: "He said 'Alhamdulillah' and the other did not say it."