Imaam Muzani (rahimahullah) narrates the following incident:

When Imaam Shaafi‘ee (rahimahullah) came to Egypt, I said to myself, “If there is any person who can answer the intricate question related to ‘Aqaa’id which is in my heart and absorbing my mind, perhaps it will be him.” With this in mind, I went to Imaam Shaafi‘ee (rahimahullah) and found him seated in the Musjid of Egypt. When I sat before him, I said, “There is an intricate mas’alah pertaining to ‘Aqaa’id in my heart (that I wish to ask). So I said, ‘There is nobody who possesses knowledge as great as that which you possess. So inform me regarding the in depth knowledge of ‘Aqaa’id that you possess.’”