Exodus 3:19-21

American Standard Version

¹⁹ And I know that the king of Egypt will not give you leave to go, no, not by a mighty hand. ²⁰ And I will put forth my hand, and smite Egypt with all my wonders which I will do in the midst thereof: and after that he will let you go. ²¹ And I will give this people favor in the sight of the Egyptians: and it shall come to pass, that, when ye go, ye shall not go empty: