Exodus 4:20-21

20So Moses put his wife and his sons on a donkey and they started on the journey back to Egypt. And Moses carried the stick of God in his hand.

21Then the Lord said to Moses, ‘When you return to Egypt you must do the signs. Do all the signs that I gave you the power to do. Do them in front of Pharaoh. But I will make Pharaoh angry and cruel. Because of this, he will not let the people go.