Moses was eighty years old1 and Aaron eighty-three when they spoke to Pharaoh.
References for Exodus 7:7
The LORD said to Moses and Aaron,
References for Exodus 7:8
"When Pharaoh says to you, 'Perform a miracle,2' then say to Aaron, 'Take your staff and throw it down before Pharaoh,' and it will become a snake."3
References for Exodus 7:9
So Moses and Aaron went to Pharaoh and did just as the LORD commanded. Aaron threw his staff down in front of Pharaoh and his officials, and it became a snake.
Pharaoh then summoned wise men and sorcerers,4 and the Egyptian magicians5 also did the same things by their secret arts:6
References for Exodus 7:11
Each one threw down his staff and it became a snake. But Aaron's staff swallowed up their staffs.
Yet Pharaoh's heart7 became hard and he would not listen8 to them, just as the LORD had said.
References for Exodus 7:13
Then the LORD said to Moses, "Pharaoh's heart is unyielding;9 he refuses to let the people go.
References for Exodus 7:14
Go to Pharaoh in the morning as he goes out to the water.10 Wait on the bank of the Nile11 to meet him, and take in your hand the staff that was changed into a snake.
References for Exodus 7:15
Then say to him, 'The LORD, the God of the Hebrews, has sent me to say to you: Let my people go, so that they may worship12 me in the desert. But until now you have not listened.13
References for Exodus 7:16
This is what the LORD says: By this you will know that I am the LORD:14 With the staff that is in my hand I will strike the water of the Nile, and it will be changed into blood.15
References for Exodus 7:17