Rise up early. Compare Exodus 7:15, and Exodus 8:20. The practice of the Egyptian kings to rise early and proceed at once to the dispatch of business is noted by Herodotus. It is a common practice of oriental monarchs.
And say unto him. The same message is constantly repeated in the same words as a token of God's unchangingness. See Exodus 8:1-20; Exodus 9:1; Exodus 10:3; etc.