Genesis 40:3

The captain of the guard, to wit, Potiphar, Genesis 37:36, who being informed by his underkeeper of Joseph's great care and faithfulness, began to have a better opinion of him, though for his own quiet, and his wife's reputation, he left him still in the prison. Where Joseph was bound; was a prisoner, as that word is used, Isaiah 22:3; for Joseph being now made governor of the prisoners, was doubtless freed from his bonds: or had been bound, and that with irons in a cruel manner, Psalms 105:18.