Exodus 4:3
And he said, "Throw it on the ground." So he threw it on the ground, and it became a serpent, and Moses ran from it.
Exodus 4:17
And take in your hand this staff, with which you shall do the signs."
Exodus 7:10-15
So Moses and Aaron went to Pharaoh and did just as the LORD commanded. Aaron cast down his staff before Pharaoh and his servants, and it became a serpent.
Amos 5:19
as if a man fled from a lion, and a bear met him, or went into the house and leaned his hand against the wall, and a serpent bit him.