Trim your moustache closely and grow your beard .

In this hadith, the Prophet Muhammad ﷺ instructed Muslims to trim their moustaches and grow their beards in order to differentiate themselves from the fire-worshippers. This is a sign of piety as it shows that one is devoted to Allah SWT and His teachings. It also serves as a reminder for Muslims not to follow the practices of those who do not believe in Allah SWT or His teachings. Furthermore, it serves as an outward sign of faith that can help strengthen one's relationship with Allah SWT by reminding them of His presence at all times. Additionally, it helps create unity among believers by showing that they are part of a larger community who share similar beliefs and values.