What is the meaning of "the Lawgiver" and how does the common person know what the Lawgiver has prohibited, and what constitutes a permissible or impermissible difference of opinion?

The word "Shari'" (Law-Giver) is used for Allah Almighty and His Messenger, peace and blessings be upon him, and has been employed by more than one scholar. It is a prerequisite for anyone who enjoins good and forbids evil that they be knowledgeable about what they are enjoining and forbidding, because knowledge of something being reprehensible can only come through the Shari'ah. If the one who forbids is unable to examine the evidence, then they must ask the people of knowledge. The common person is not required to forbid subtle and intricate matters; rather, these should be left to the scholars. They should only account for clear and well-known matters. If the opinions of scholars differ, the common person must follow the one they trust in their knowledge and piety.