And Joseph's master took him, and put him into the prison, a place where the king's prisoners were bound: and he was there in the prison. Put him into the prison - בית סהר beith sohar, literally the round house; in such a form the prison was probably built.
Related Commentaries of Genesis 39:20
Genesis 39:20
20 And Joseph's master took him, and put him into the prison, a place where the king's prisoners were bound: and he was there in the prison.