And the Lord spake unto Moses and unto Aaron After he had given them their commission, and instructions to go to Pharaoh, and a little before they went in to him:
9
"Moses, when the king asks you to do a miracle, tell Aaron to throw his walking stick down in front of the king, and it will become a snake."
10
So Moses and Aaron went to the king as the Lord had commanded. Aaron threw his walking stick down in front of the king and his officers, and it became a snake.