Exodus 4:20-22

Amplified Bible

²⁰ So Moses took his wife [Zipporah] and his sons [Gershom and Eliezer] and seated them on donkeys, and returned to the land of Egypt. Moses also took the staff of God in his hand.

²¹ The Lord said to Moses, “When you return to Egypt, see that you perform before Pharaoh all the wonders (miracles) which I have put in your hand, but I will harden his heart and make him stubborn so that he will not let the people go. ²² Then you shall say to Pharaoh, ‘Thus says the Lord, “Israel is My son, My firstborn.