Exodus 9:13 in the King James Version
And the LORD said unto Moses, Rise up early in the morning, and stand before Pharaoh, and say unto him, Thus saith the LORD God of the Hebrews, Let my people go, that they may serve me.
Context
12 The LORD hardened the heart of Pharaoh, and he didn’t listen to them, as the LORD had spoken to Moses.
13 The LORD said to Moses, “Rise up early in the morning, and stand before Pharaoh, and tell him, ‘This is what the LORD, the God of the Hebrews, says: “Let my people go, that they may serve me.
14 For this time I will send all my plagues against your heart, against your officials, and against your people; that you may know that there is no one like me in all the earth.