Exodus 4:12

10 But Moses pleaded with the Lord, “O Lord, I’m not very good with words. I never have been, and I’m not now, even though you have spoken to me. I get tongue-tied, and my words get tangled.”

11 Then the Lord asked Moses, “Who makes a person’s mouth? Who decides whether people speak or do not speak, hear or do not hear, see or do not see? Is it not I, the Lord? 12 Now go! I will be with you as you speak, and I will instruct you in what to say.”