Exodus 7:12-14

New International Version - UK

¹² each one threw down his staff and it became a snake. But Aaron’s staff swallowed up their staffs. ¹³ Yet Pharaoh’s heart became hard and he would not listen to them, just as the Lord had said.

The plague of blood

¹⁴ Then the Lord said to Moses, ‘Pharaoh’s heart is unyielding; he refuses to let the people go.