Exodus 11:9-10

11:9 The Lord said to Moses, “Pharaoh will not listen to you, so that my wonders ¹  may be multiplied in the land of Egypt.”

11:10 So Moses and Aaron did all these wonders before Pharaoh, but the Lord hardened Pharaoh’s heart, and he did not release the Israelites from his land.

[11:9]  ¹ sn The thought is essentially the same as in Exod 7:3-4, but the wonders, or portents, here refer to what is yet to be done in Egypt.