As a right one Muslim enjoys over another, one should reply to the person who sneezes. Hadhrat Anas Bin Malik (رضى الله تعالى عنه) narrates that two people sneezed in the presence of Rasulullah (صلى الله عليه وسلم). He replied to one and not the other. The one who did not get the reply of Yar-Hamukullah said: “So and so sneezed and you replied but you did not do so when I sneezed?” The Holy Prophet (صلى الله عليه وسلم)