Exodus 4:12 in the King James Version
Now therefore go, and I will be with thy mouth, and teach thee what thou shalt say.
Context
11 The LORD said to him, “Who made man’s mouth? Or who makes one mute, or deaf, or seeing, or blind? Isn’t it I, the LORD?
12 Now therefore go, and I will be with your mouth, and teach you what you shall speak.”
13 Moses said, “Oh, Lord, please send someone else.”