What is the ruling of praying behind a person who shaves his beard and even makes fun of those who let it grow, and he orders them to shave it?
Answer: It is not allowed to make fun of a person who grows his beard, because growing it is only obedience to the order of Allah’s Messenger (peace be upon him). You should advise the mocker, explaining to him that by making fun of the beard, he may not only be committing a major sin but he also may be committing an act of disbelief. Allah Almighty says:
Say: “Was it at Allah, and His verses and His Messenger (peace be upon him) that you were mocking?” Make no excuse; you have disbelieved after you had believed. [Qur’an, 9:65-66]