Exodus 7:8-10

Complete Jewish Bible

(iv) ⁸ Adonai said to Moshe and Aharon, ⁹ “When Pharaoh says to you, ‘Perform a miracle,’ tell Aharon to take his staff and throw it down in front of Pharaoh, so that it can become a snake.” ¹⁰ Moshe and Aharon went in to Pharaoh and did this, as Adonai had ordered — Aharon threw down his staff in front of Pharaoh and his servants, and it turned into a snake.