From my knowledge I am not read or learn any Hadith about the limit of beard. I have a little beard. Some people says that you must want to put beard that define limit of four Imam. But I disagree(Ikhtilaf) with them. Can I Reject the rules of them? Is there is any Hadith about the limit of beard? Any further lecture on beard from (S.A.W) or any of his Companian?
According to my research there is no disagreement (ikhtilaf) of our four imam on bread. Every imam have a bread in the limit of one hand. There are also the bread of 1 lac and 24 thousand prophet and also the 1 lac and 24 thousand sahaba. There are also the hadith about the limit of bread. Bread is THE sunnah of Holy Prophet (S.A.W).
Understand that the Imams do not give their opinions on whims but base it on evidence and principles of interpreting that evidence.
The evidence for not cutting the beard less than a fist includes the hadith narrated by Ibn Umar and his implementation of it:
عن ابن عمر، عن النبي صلى الله عليه وسلم قال " خالفوا المشركين، وفروا اللحى، وأحفوا الشوارب ". وكان ابن عمر إذا حج أو اعتمر قبض على لحيته، فما فضل أخذه
The Prophet (ﷺ) said, "Do the opposite of what the pagans do. Keep the beards and cut the mustaches short". Whenever Ibn Umar performed the Hajj or Umra, he used to hold his beard with his hand and cut whatever remained outside his hold.