Exodus 11:9-10

Darby Translation

⁹ And Jehovah had said to Moses, Pharaoh shall not hearken to you; that my wonders may be multiplied in the land of Egypt.

¹⁰ And Moses and Aaron did all these wonders before Pharaoh; but Jehovah made Pharaoh's heart stubborn, and he did not let the children of Israel go out of his land.