Why Muslims grow beards

There are several sources for the Muslim saying about beards, one of which is that the Prophet wanted Muslims to be able to distinguish themselves from non-Muslims, for example, the Persians kept the beards above their lips and shaved their chin beards, so the Prophet said, "Cut off as much as you can of the beard above the lips (and keep it short), and keep the chin beard". Does this mean that Allah is narrow-minded? To oppose the Persians and the Jews outwardly because he hates them?

Another theory is that Allah created man and woman, and men will grow beards and women won't, so men should keep their beards in accordance with nature, and if they don't, they're not in accordance with nature and Allah's will. Sikh men and women just naturally grow long hair and believe that growing it is obedience to God's perfect will.

There is also a saying that keeping a beard indicates a man's chastity and dignity, and that Muslims are very conservative and repressive about sex, and that keeping a beard represents a renunciation of sex for fear that a woman will see a man's exposed cheeks and desire them. This is similar to the Chinese monk who shaved his hair to show his renunciation of the world (including women). So in the Muslim world, men wear beards and women wear masks so that men and women cannot see each other's opposite sex features (handsome cheeks for men and pretty faces for women) and develop evil desires.

There is no mention in the Koran of the need for Muslims to grow a beard, so most Muslim scholars now believe that by growing a beard (note that Muslims grow a beard by leaving a bar-beard) they are showing obedience to the Prophet, and that this is up to the believer's voluntary choice to decide, and is not obligatory.

Whatever the reason for the Muslims' religious preference for the appearance of beards, it is a historical and cultural thing, just as in the Qing Dynasty, when it was considered standard to wear long braids.

Muslims, in addition to believing that leaving a bar moustache is a Muslim-specific behavior, also include such things as distinguishing between Muslims and non-Muslims:

Circumcision, removal of pubic and armpit hair, and trimming of fingernails. The original sentence reads: The Prophet Mohammad said that the human form (English Fitra, Arabic ?) There are five things: circumcision, shaving the pubic hair, trimming the beard on the upper lip, trimming the nails, and plucking the armpit hair.