Charles Ellicott Commentary Exodus 9:13

"And Jehovah said unto Moses, Rise up early in the morning, and stand before Pharaoh, and say unto him, Thus saith Jehovah, the God of the Hebrews, Let my people go, that they may serve me." — Exodus 9:13 (ASV)

Early in the morning. —Compare Exodus 7:15; Exodus 8:20.