The Ruling on answering the One Who sneezes while the Imam is delivering the Sermon
Question:
What is the ruling on answering the one who sneezes while the Imam is delivering the sermon on Friday?
Answer:
It is not lawful, as it is obligatory to be silent, so just as a person who sneezes is not answered during the prayer, neither is he answered during the Khutbah. And Allaah is the Granter of success.
Source:
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Vol. 2 Page 445