There are various ahadith of Rasulullah in which the keeping and lengthening of the beard have been ordered. We will just mention a few that prove the above claim.
1) Imam Bukhari (Rahimahullaah) reports on the authority of Imam Nafi' [ra] who narrates from Sayyiduna Abdullah ibn Umar, Radi-Allahu anhu, that Rasulullah said, 'Oppose the Mushrikeen (polytheists); lengthen the beards and trim the moustaches.'
Imam Nafi' (RA) further states, 'And ibn Umar, Radi-Allahu anhu, during Hajj or Umrah used to hold on to his beard with his fist and cut off whatever was in excess of that.' (Bukhari vol.2 pg.875; Kitab-ul-Libas no.5892)
Note: This hadith has also been narrated by Sayyiduna Abu Huraira [Radhiallaahu anhu] and he is also reported to have trimmed his beard beyond one fist.
The verdict of the growing of the beard being wajib (obligatory) is deduced from this hadith. That is because any explicit command of Rasulullah will be regarded as wajib, if there is no apparent, clear reason/proof which states that that particular command is for istihbab (preference). This is an established fact in usool-ul-fiqh (principles of jurisprudence). Rasulullah has commanded the Ummah to lengthen the beards. Allah Ta'ala has mentioned in the noble Qur'an, 'Those who disobey his (Rasulullah - Sallallaahu Alayhi Wasallam) should beware of a trial or painful punishment that will afflict them.' (Surah Noor 63)
Allamah Nawawi (RA) has explained that this hadith has been reported with various wordings:
The word, 'Waffiroo' is mentioned in Sahih Bukhari (Hadith5892). In another narration of Bukhari. The words 'Ufoo' is mentioned (Sahih Bukhari Hadith5893). The word 'Arkhoo' is mentioned in Sahih Muslim (Hadith602). The word 'Awfoo' is mentioned in Sahih Bukhari (Hadith5892) and Sahih Muslim (Hadith601). All these words imply the same meaning and that is to lengthen and to increase the growth of the beard. (Fathul Bari vol.10 pg.429, 431; Sharh al-Nawawi ala Saheeh Muslim vol.2 pg.143)
Hafiz ibn Jareer al-Tabari (ra) has stated that some Ulama have totally disliked that one trim his beard at all, while others have permitted trimming beyond a fist length. (Fathul Bari vol.10 pg.430)
2) When the two messengers of Kisra (Khusru - the Persian King) came to Rasulullah , they had long moustaches and shaved beards. Rasulullah [sallallaahu alayhi wasallam turned his face away in disgust and asked them, 'Who commanded you to do this (despicable deed)?' They replied, 'Our Lord, (i.e. King)' At this, Rasulullah mentioned, 'But my Lord has commanded me to lengthen my beard and shorten my moustache.' (Tabaqaat ibn Sa'ad vol.1 pg.147; Taareekh Tabari vol.2 pg.267-266; Bidaaya wan Nihaaya)
3) In this narration, Rasulullah has stated that to lengthen the beard is in fact the command of Allah Ta'ala Himself.
Furthermore, the Wujoob is further emphasized by the fact that Rasulullah did practice this in his entire life. Know well that Rasulullah did not trim his beard in his life. In fact, the beard of Rasulullah was dense and almost covered his blessed chest. (Shamaail Tirmidhi Hadith8; Dalaail al-Nubuwwah of Imaam Bayhaqi vol.1 pg.235)
Actions of the Sahaba [radhiallaahu anhum] The narrator (Ibn Umar, Radi-Allahu anhu, himself trimmed his beard beyond a fist's length, this implies that the wujoob of keeping a beard is up to a fist length only (this will be explained shortly).
Furthermore, this (trimming beyond a fist length) has also been reported from Sayyiduna Abu Huraira, Radi-Allahu anhu, and other Tabi'een. (Tamheed of ibn Abdul-Barr al-Muntaqaa and Fathul Baari vol.10 pg.430). Bear in mind that Sayyiduna Abu Huraira [radhiallaahu anhu] has also narrated a hadith wherein we are commanded to lengthen the beards. (Sahih Muslim Hadith602)
Moreover, for the benefit of your knowledge, the sayings and actions of the Sahaba (Radhiallaahu Anhum) are a Hujjah (proof). This is also an established principle in usool-ul-fiqh.
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Book 004, Number 0993: (Sahih Muslim)
Ibn 'Abbas reported: The Messenger of Allah (may peace be upon him) had been commanded to prostrate on seven (bones) and forbidden to fold back hair and clothing.
,
This should be enough, its makrooh to do it, salam
And
Sahih al-Bukhari: Volume 1, Book 12, Number 773
Ibn Abbas (radiAllahu anhu) narrates that the Messenger of Allah (sallAllahu alaihi wa aalihi wa sallam) was ordered to prostrate on seven parts and not to tuck up the clothes or hair [while praying]. Those parts are: the forehead [along with the tip of nose], both hands, both knees, and [toes of] both feet.[end]
hope its enough , When hadiths say it than you should avoid it
salaam.
isnt this supposed to mean not to mess about with your clothes and hair when you are in the actual act of praying. ie when you are actually in namaz. if it was meant at all times then it would mean we cant fold (comb over?) our hair at all other times as well which isnt true. also the hadith says clothes and does not actually mention the izar.
besides, there are other hadith regarding keeping the trousers above the ankles.....
Volume 7, Book 72, Number 678:
Narrated Abu Huraira:
The Prophet said, "The part of an Izar which hangs below the ankles is in the Fire."
Volume 7, Book 72, Number 679:
Narrated Abu Huraira:
Allah's Apostle, "Allah will not look, on the Day of Resurrection, at a person who drags his Izar (behind him) out of pride and arrogance
Volume 7, Book 72, Number 675:
Narrated 'Abdullah bin 'Umar:
The Prophet said Allah will not look, on the Day of Resurrection at the person who drags his garment (behind him) out of conceit. On that Abu Bakr said, "O Allah's Apostle! One side of my Izar hangs low if I do not take care of it." The Prophet said, 'You are not one of those who do that out of conceit."
Volume 7, Book 72, Number 681:
Narrated 'Abdullah bin 'Umar:
Allah's Apostle said, "While a man was dragging his Izar on the ground (behind him), suddenly Allah made him sink into the earth and he will go on sinking into it till the Day of Resurrection."