Exodus 7:5-15 NIV

5 And the Egyptians will know that I am the LORD 1 when I stretch out my hand2 against Egypt and bring the Israelites out of it."

References for Exodus 7:5

6 Moses and Aaron did just as the LORD commanded3 them.

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      7 Moses was eighty years old4 and Aaron eighty-three when they spoke to Pharaoh.

      References for Exodus 7:7

      Aaron's Staff Becomes a Snake

      8 The LORD said to Moses and Aaron,

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          9 "When Pharaoh says to you, 'Perform a miracle,5' then say to Aaron, 'Take your staff and throw it down before Pharaoh,' and it will become a snake."6

          References for Exodus 7:9

          10 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.
          11 Pharaoh then summoned wise men and sorcerers,7 and the Egyptian magicians8 also did the same things by their secret arts:9

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          12 Each one threw down his staff and it became a snake. But Aaron's staff swallowed up their staffs.
          13 Yet Pharaoh's heart10 became hard and he would not listen11 to them, just as the LORD had said.

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              The Plague of Blood

              14 Then the LORD said to Moses, "Pharaoh's heart is unyielding;12 he refuses to let the people go.

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              15 Go to Pharaoh in the morning as he goes out to the water.13 Wait on the bank of the Nile14 to meet him, and take in your hand the staff that was changed into a snake.

              References for Exodus 7:15