Al-Khaṭīb relates, on the authority of Abū Saʿīd, that the Messenger of Allah ﷺ said, “None of you is to take anything from the length of his beard.”
Al-Durr al-Mukhtār states: “As for trimming it when it is less than a fistful—as some North-Africans and the effeminate among men do—no scholar has ever deemed this permissible.”
Allah the Exalted says, “Indeed, in the Messenger of Allah you have an excellent model for whoever hopes for Allah and the Last Day” (1) [al-Aḥzāb 33:21]. He also says, “Whatever the Messenger gives you, take it, and whatever he forbids you, refrain from it” (2) [al-Ḥashr 59:7]. And He says, “O you who believe, obey Allah and His Messenger, and do not turn away from him while you hear. Do not be like those who say, ‘We hear,’ yet they do not hear” (3) [al-Anfāl 8:20-21]. He further says, “Let those who oppose his command beware, lest a trial afflict them or a painful punishment befall them” (4) [al-Nūr 24:63]. And He says, “Whoever contends with the Messenger after guidance has become clear to him and follows a path other than that of the believers, We shall turn him to what he has chosen and roast him in Hell—what an evil destination!” (5) [al-Nisāʾ 4:115].
Allah—magnified and exalted—is the One who has beautified men with beards. It is also reported that the angels’ glorification includes: “Glory be to Him who adorned men with beards.” Al-Tamḥīd states, “Shaving the beard is unlawful, and none does it except…"