When one Sneezes and does not Praise Allah
Anas (radi Allahu anhu) reported: When two men sneezed in the presence of the Prophet (sal Allahu alaihi wa sallam), he responded to one with “Yarhamuk-Allah (may Allah have mercy on you)” and did not respond to the other. The latter said to him: “You invoked a blessing on this man but did not do so in my case.” The Prophet (sal Allahu alaihi wa sallam) replied, “He praised Allah (i.e., he said ‘Al-hamdu lillah’) but you did not.”
[Sahih Al-Bukhari and Muslim]
We benefit once again from this Hadith that we should only say ‘Yarhamuk-Allah’ to the sneezer who says ‘Al-hamdu lillah’ after sneezing.
And Allah knows best!