Exodus 4
10 Ref And Moses said to the Lord, O Lord, I am not a man of words; I have never been so, and am not now, even after what you have said to your servant: for talking is hard for me, and I am slow of tongue.
11 Ref And the Lord said to him, Who has made man's mouth? who takes away a man's voice or hearing, or makes him seeing or blind? Is it not I, the Lord?