13 Yahweh said to Moses, “Rise up early in the morning, and stand before Pharaoh, and tell him, ‘This is what Yahweh, the God of the Hebrews, says: “Let my people go, that they may serve me.
Exodus 9:13 Cross References - WEB
Exodus 7:15
15 Go to Pharaoh in the morning. Behold, he is going out to the water. You shall stand by the river’s bank to meet him. You shall take the rod which was turned to a serpent in your hand.
Exodus 8:20
20 Yahweh said to Moses, “Rise up early in the morning, and stand before Pharaoh; behold, he comes out to the water; and tell him, ‘This is what Yahweh says, “Let my people go, that they may serve me.
Exodus 9:1
1 Then Yahweh said to Moses, “Go in to Pharaoh, and tell him, ‘This is what Yahweh, the God of the Hebrews, says: “Let my people go, that they may serve me.