Exodus 7:12-14

Revised Standard Version

¹² For every man cast down his rod, and they became serpents. But Aaron’s rod swallowed up their rods. ¹³ Still Pharaoh’s heart was hardened, and he would not listen to them; as the Lord had said.

The First Plague: Water Turned to Blood

¹⁴ Then the Lord said to Moses, “Pharaoh’s heart is hardened, he refuses to let the people go.