Exodus 4:11

9It will happen, if they will not believe even these two signs or listen to your voice, that you shall take of the water of the river, and pour it on the dry land. The water which you take out of the river will become blood on the dry land.”

10Moses said to the LORD, “O Lord, I am not eloquent, neither before now, nor since you have spoken to your servant; for I am slow of speech, and of a slow tongue.”

11The 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?

12Now therefore go, and I will be with your mouth, and teach you what you shall speak.”

13Moses said, “Oh, Lord, please send someone else.”