What is the ruling on the beard, along with references and page numbers?

Scholars differ on the ruling concerning growing the beard, with two opinions:

The first opinion: The obligation of growing it, which is the view of the Hanafis, Malikis, and Hanbalis.

The second opinion: The recommendation of growing it, which is the view of some later Shafi'is, while others among them definitively ruled that shaving it is forbidden.