Genesis 41:46

And Joseph was thirty years old when he stood before Pharaoh, king of Egypt. He had thus been in the country for thirteen years, a number of which he had spent in disgrace in prison. And Joseph went out from the presence of Pharaoh, and went throughout all the land of Egypt. He made a formal tour of inspection in order to perfect his plans, especially for the storing of the grain which would be demanded as a tax extraordinary.