Exodus 4:10

But Moses said to God, “Who am I, that I should go to Pharaoh, and that I should bring the sons of Israel out of Egypt?”

But Moses spoke before Yahweh, saying, “Behold, the sons of Israel have not listened to me; how then will Pharaoh listen to me, for I am of uncircumcised lips?”

But Moses said before Yahweh, “Behold, I am of uncircumcised lips; how then will Pharaoh listen to me?”

Then I said, “Alas, Lord Yahweh! Behold, I do not know how to speak Because I am a youth.”

“Indeed, I brought you up from the land of Egypt And ransomed you from the house of slavery, And I sent before you Moses, Aaron, and Miriam.

Aaron to Speak for Moses