The ruling on combing the Beard for the Person who wants to perform the Adhha sacrifice
Question :
I want to perform the Adhha sacrifice and after the 10 days of Thul-Hijjah begin, I comb the hair of my beard and some hair fall from it when combing it. So, should I comb it or not?
Answer:
Whatever falls from the beard unintentionally while combing it is pardoned, because it is considered dead hair. Likewise, whatever falls from the head of someone in Ihram and from his beard unintentionally at the time of Wudhu' and bathing is pardoned, as it is considered dead hair. This ruling applies to whoever wants to perform the Adhha sacrifice after the entry of the 10 days (of Thul-Hijjah). It is only forbidden to intentionally cut something from that while in Ihram or after the entry of the 10 days of Thul-Hijjah for whoever wants to perform the Adhha sacrifice. In reference to the hair of the beard, it is not permissible to intentionally cut anything from it - not during Ihram, nor during any other time. This is due to the statement of the Prophet:
"Cut the moustaches and leave the beards. Be different from the Mushrikin (i.e., polytheists, idolaters, those who associate partners with Allah)."
This Hadith is agreed upon. And success is from Allâh.
Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Page 327