The Fourth Right:
“And when he sneezes and praises Allaah, then pray for mercy upon him.” This is due to the fact that sneezing is a favor from Allaah, in the expelling of this congested air that is blocked in certain parts of the body of the human being. Allaah makes it easy for this air to have a passage out where it can exit, and thus the sneezing person feels relief. Thus, the Prophet (sallallaahu ‘alayhi wa sallam) legislated that the person praise Allaah for this favor, and he legislated for his (Muslim) brother to say to him, “May Allaah have mercy upon you.” He also commanded the person who sneezed to answer his (Muslim) brother by saying to him, “May Allaah guide you and set right your affairs.” Therefore, whoever does not praise Allaah, then he does not deserve for others to pray for mercy upon him, and in this case he cannot blame anyone except himself. For he is the one who has caused himself to lose the two blessings: the blessing of praising Allaah, and the blessing of his brother’s supplication for him that is a result of the praising.