Charles Ellicott Commentary Genesis 40:8

"And they said unto him, We have dreamed a dream, and there is none that can interpret it. And Joseph said unto them, Do not interpretations belong to God? tell it me, I pray you." — Genesis 40:8 (ASV)

There is no interpreter. —In Egypt it was the business of men trained for the purpose, called in Genesis 41:8, magicians and wise men, to interpret dreams, and to these men the butler and baker could have no access from their prison. But Joseph denies that art and training can really be effective, and claims that interpretation belongs to God.