When one sneezes
The Prophet (sal Allahu alaihi wa sallam) said, “When one of you sneezes he should say: ‘Al-hamdu lillah (praise be to Allah),’ and his brother or his companion should say to him: ‘Yarhamuk-Allah (may Allah have mercy on you).’ When he says this he should reply: ‘Yahdikum-ullah wa yuslihu balakum (may Allah guide you and render sound your state of affairs).”‘
This Hadith teaches Muslims to have good wishes for one another and to return good for good.
This reciprocity increases mutual love and results in the unity, peace and dynamism of the Muslim society.
And Allah knows best!