Exodus 7:9
King James Version
“When Pharaoh shall speak unto you, saying, Shew a miracle for you: then thou shalt say unto Aaron, Take thy rod, and cast before Pharaoh, it shall become a serpent.”
Context
6And Moses and Aaron did as the LORD commanded them, so did they.
7And Moses fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.
8And the LORD spake unto Moses and unto Aaron, saying,
9When Pharaoh shall speak unto you, saying, Shew a miracle for you: then thou shalt say unto Aaron, Take thy rod, and cast before Pharaoh, it shall become a serpent.
10And Moses and Aaron went in unto Pharaoh, and they did so as the LORD had commanded: and Aaron cast down his rod before Pharaoh, and before his servants, and it became a serpent.
11Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments.
12For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.