Exodus 7:3-12

3And I will harden Pharaoh’s heart, and multiply My signs and My wonders in the land of Egypt.

4But Pharaoh will not heed you, so that I may lay My hand on Egypt and bring My armies and My people, the children of Israel, out of the land of Egypt by great judgments.

5And the Egyptians shall know that I am the Lord, when I stretch out My hand on Egypt and bring out the children of Israel from among them.”

6Then Moses and Aaron did so; just as the Lord commanded them, so they did.

7And Moses was eighty years old and Aaron eighty-three years old when they spoke to Pharaoh.

8Then the Lord spoke to Moses and Aaron, saying,

9“When Pharaoh speaks to you, saying, ‘Show a miracle for yourselves,’ then you shall say to Aaron, ‘Take your rod and cast it before Pharaoh, and let it become a serpent.’ ”

10So Moses and Aaron went in to Pharaoh, and they did so, just as the Lord commanded. And Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent.

11But Pharaoh also called the wise men and the sorcerers; so the magicians of Egypt, they also did in like manner with their enchantments.

12For every man threw down his rod, and they became serpents. But Aaron’s rod swallowed up their rods.