The prophet pbuh said The meaning of the Hadith is trim the mustache and leave the beard. Let it grow. Today, when keeping a beard is not very fashionable, it is a sign of a proof that you love the prophet pbuh. You my dear Muslim men. Those of you who keep the beard.

It is a sign that you show that you belong to Muhammad pbuh and to his companions. This is why the word Aal. It means the people who belong to the Prophet pbuh.