Exodus 4:16-18 New King James Version (NKJV)

16. So he shall be your spokesman to the people. And he himself shall be as a mouth for you, and you shall be to him as God.

17. And you shall take this rod in your hand, with which you shall do the signs.”

18. So Moses went and returned to Jethro his father-in-law, and said to him, “Please let me go and return to my brethren who are in Egypt, and see whether they are still alive.”And Jethro said to Moses, “Go in peace.”

Exodus 4