Exodus 7:9-10 ▼

9 “When Pharaoh speaks to you, saying, ‘Work a miraculous wonder,’ then you shall say to Aaron, ‘Take your staff and throw it down before Pharaoh, that it may become a serpent.’”

10 So Moses and Aaron came to Pharaoh, and thus they did just as Yahweh had commanded; and Aaron threw his staff down before Pharaoh and his servants, and it became a serpent.