Exodus 4:9-11

Amplified Bible, Classic Edition

⁹ But if they will also not believe these two signs or heed your voice, you shall take some water of the river [Nile] and pour it upon the dry land; and the water which you take out of the river [Nile] shall become blood on the dry land.

¹⁰ And Moses said to the Lord, O Lord, I am not eloquent or a man of words, neither before nor since You have spoken to Your servant; for I am slow of speech and have a heavy and awkward tongue.

¹¹ And the Lord said to him, Who has made man’s mouth? Or who makes the dumb, or the deaf, or the seeing, or the blind? Is it not I, the Lord?