What is the definition of the beard according to sharee’ah?
Question

                It was narrated that Ibn ‘Umar (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Be different from the mushrikeen, trim the moustache and let the beard grow.” (Narrated by al-Bukhaari, 5892, Muslim, 601). 

Question: what is the definition of the beard according to sharee’ah, which we are forbidden to shave?
Praise be to Allah. 
          Shaykh Ibn Baaz (may Allaah have mercy on him) said: 
 
          The beard (al-lahyah) is that which grows on the cheeks 
          and chin, as was explained by the author of al-Qaamoos. It is obligatory 
          to leave the hair that grows on the cheeks and chin, and not to shave 
          it or cut it. 
 
          May Allaah reform the affairs of all the Muslims. 
 
          Fataawa Islamiyyah, 2/325. 
 
          Shaykh Ibn ‘Uthaymeen said: 
 
          The definition of the beard (al-lahyah) as stated by 
          the scholars of the (Arabic) language is the hair of the face, jawbone 
          and cheeks, in the sense that everything that grows on the cheeks, jawbone 
          and chin is part of the beard. Removing any part of it also comes under 
          the heading of sin, because the Messenger 
          
          (peace and blessings of Allaah be upon him) said: “Leave the beard alone” 
          and “Let the beard grow.” This indicates that it is not permissible 
          to remove any part of it, but the sin varies in degree; shaving is more 
          serious than removing a part of it because it is a more extreme action 
          and the one who shaves it more clearly goes against the command than 
          the one who trims it. 
 
          Fataawa Hammah, p. 36 
 
          See also Question no.  
          8196.