The Magians were mentioned to the Messenger of Allah ﷺ, and he said, "They let their mustaches grow long and shave their beards, so differ from them."Ibn Umar would trim his mustache the way a sheep or a camel is sheared.
ذكر لرسول الله ﷺ المجوس فقال: إنهم يوفون سبالهم، ويحلقون لحاهم، فخالفوهم. فكان ابن عمر يجز سباله كما تجر الشاة أو البعير.
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Ibn Hibban narrated it (5476) from Husayn bin Muhammad bin Abu Mashar, who said, Muhammad bin Madan Harrani told us, who said, Hasan bin Muhammad bin Ayan told us, who said, Maqil bin Ubaydullah told us, from Maymun bin Mihran, from Ibn Umar, who mentioned it. Its isnad is hasan because of Maqil bin Ubaydullah Jazari, Abu Abdullah Absi, for his hadith is hasan. Imam Ahmad said, "His hadith is sound." Ibn Main and Nasai said, "There is no harm in him."As for what is reported from Ibn Abbas, who said, "The Messenger of Allah ﷺ used to trim his mustache, and your father Ibrahim before him used to trim his mustache." This contains weakness. Tirmidhi narrated it (2760), and Ahmad (2738), both from the hadith of Simak bin Harb, from Ikrima, from Ibn Abbas, who mentioned it. Simak bin Harb is inconsistent in his narration from Ikrima, and this is one instance of that.On this subject there is also what is reported from Ata bin Yasar, who related that the Messenger of Allah ﷺ was in the masjid when a man with disheveled hair and beard entered. The Messenger of Allah ﷺ gestured to him with his hand to go out, apparently meaning for him to fix the hair of his head and beard. The man did so, then returned, and the Messenger of Allah ﷺ said, "Is this not better than one of you coming with disheveled hair, looking like a devil?" Malik narrated it in the chapter on hair (7), from Zayd bin Aslam, from Ata bin Yasar, and it is mursal.From Saeed bin Musayab, who said, "Ibrahim ﷺ was the first person to host a guest, the first person to be circumcised, the first person to trim his mustache, and the first person to see gray hair. He said, 'O Lord, what is this?' Allah said, 'Dignity, O Ibrahim.' He said, 'Lord, increase me in dignity.'" Malik narrated it in the chapter on the description of the Prophet ﷺ (4), from Yahya bin Saeed, from Saeed bin Musayab.Jurisprudence of the chapter. There are five different narrations concerning leaving the beard to grow, they are, "Spare them," "Complete them," "Let them hang loose," "Let them grow," and "Let them be full." All of them mean the same thing, leaving it as it is. This is the apparent meaning of these narrations, and a group of the early scholars held this view, disliking that anything be taken from the beard's length or width. Some scholars said, "It is possible that there is a limit to letting the beard grow, based on what has been reported from Ibn Umar and others."Qadi Iyad said, "It is disliked to shave it, cut it short, or singe it. As for trimming from its length and width, that is good. Excessive attention in making it prominent is disliked, just as it is disliked in cutting and shearing it." Nawawi said, "The scholars mentioned ten disliked traits regarding the beard, some uglier than others. The ninth of them is leaving it disheveled and matted to display asceticism and a lack of care for oneself."The early scholars then disagreed over whether there is a limit to this. Some of them set no specific limit, except that one should not leave it to the point of becoming notorious, but should rather trim from it. Malik disliked it being excessively long. A group of the early scholars held that whatever exceeds a fistful should be trimmed off, based on the practice of Ibn Umar and Abu Hurairah, both of whom narrated the hadith about leaving the beard to grow. Umar did that to a man, as Ibn Hajar mentioned in Fath al-Bari (10/350).As for what is reported from Amr bin Shuayb, from his father, from his grandfather, that the Messenger of Allah ﷺ used to trim his beard, keeping its length even, this is daif. Tirmidhi narrated it (2762) from Hannad, who said, Umar bin Harun told us, from Usama bin Zayd, from Amr bin Shuayb, who mentioned it. Tirmidhi said, "This is a rare hadith. I heard Muhammad bin Ismail say, 'Umar bin Harun is of moderate reliability in hadith. I do not know of any hadith of his without basis,' or he said, 'that he narrates alone,' except for this hadith, "The Prophet ﷺ used to trim his beard, both its width and its length." We do not know it except through the hadith of Umar bin Harun, and I found him to hold a favorable opinion of Umar.'"I say, this Umar bin Harun is Balkhi, whom most scholars considered daif. Abu Dawud said, "Not trustworthy." Nasai said, "His hadith is discarded." Ibn Hibban said, "He narrates problematic reports from trustworthy narrators, and claims teachers he never actually met."As for the statement of the Prophet ﷺ, "Differ from the polytheists, trim your mustaches closely, and let your beards grow full," this is because it was the custom of the Persians to lengthen their mustaches and to cut their beards very short or shave them off, so the Lawgiver forbade that, in order to differ from them.As for trimming the mustaches closely, its meaning is to be thorough in cutting, since another narration says, "Shear the mustaches." Shearing means cutting, and this is indicated by the wording in the Sahihayn, "Trimming the mustache is part of the fitrah," and the story of Mughira bin Shuba. For this reason, many of the early scholars held that whatever of the mustache grows beyond the lip should be trimmed. Malik said, as recorded in Muwatta, in the chapter on the description of the Prophet ﷺ (4), "The mustache should be trimmed until the edge of the lip appears, which is the border, and one should not shave it away completely, disfiguring himself."Ibn Umar, when he shaved during Hajj or Umrah, would trim from his beard and mustache, as Malik mentioned in Muwatta, in the chapter on Hajj (200).The people of Kufa held the view of removing the mustache entirely and shaving it off, because the linguistic meaning of close trimming is complete removal. It is said, "So-and-so trimmed the hair closely," meaning he removed it entirely. Both practices are permissible, since the sunnah points to both, and the disagreement is only over which is preferable. The people of Madinah held the view of shearing and trimming, while the people of Kufa held the view of complete removal.