Exodus 4:8-10

New Revised Standard Version Catholic Edition

⁸ “If they will not believe you or heed the first sign, they may believe the second sign. ⁹ If they will not believe even these two signs or heed you, you shall take some water from the Nile and pour it on the dry ground; and the water that you shall take from the Nile will become blood on the dry ground.”

¹⁰ But Moses said to the Lord, “O my Lord, I have never been eloquent, neither in the past nor even now that you have spoken to your servant; but I am slow of speech and slow of tongue.”