Exodus 4:20-22

Darby Translation

²⁰ And Moses took his wife and his sons, and set them riding upon an ass, and he returned to the land of Egypt. And Moses took the staff of God in his hand.

²¹ And Jehovah said to Moses, When thou goest to return to Egypt, see that thou do all the wonders before Pharaoh that I have put in thy hand. And I will harden his heart, that he shall not let the people go.

²² And thou shalt say to Pharaoh, Thus saith Jehovah: Israel is my son, my firstborn.