He will speak to the people for you. He will be your spokesman, and it will be as if you were God to him.

Exodus 4:12
Now go! I will help you as you speak, and I will teach you what to say."

Exodus 4:30
and Aaron relayed everything the LORD had said to Moses. And Moses performed the signs before the people,

Exodus 7:1
The LORD answered Moses, "See, I have made you like God to Pharaoh, and your brother Aaron will be your prophet.

Exodus 7:2
You are to speak all that I command you, and your brother Aaron is to tell Pharaoh to let the Israelites go out of his land.

Jeremiah 36:32
Then Jeremiah took another scroll and gave it to the scribe Baruch son of Neriah, and at Jeremiah's dictation he wrote on it all the words of the scroll that Jehoiakim king of Judah had burned in the fire. And many similar words were added to them.

And he shall be your spokesman to the people: and he shall be, even he shall be to you instead of a mouth, and you shall be to him instead of God.