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
"When Par`oh speaks to you, saying, 'Perform a miracle!' then you shall tell Aharon, 'Take your rod, and cast it down before Par`oh, that it become a serpent.'"
10
Moshe and Aharon went in to Par`oh, and they did so, as the LORD had commanded: and Aharon cast down his rod before Par`oh and before his servants, and it became a serpent.