Exodus 4:8-10

Revised Standard Version

⁸ “If they will not believe you,” God said, “or heed the first sign, they may believe the latter sign. ⁹ If they will not believe even these two signs or heed your voice, you shall take some water from the Nile and pour it upon the dry ground; and the water which you shall take from the Nile will become blood upon the dry ground.”

¹⁰ But Moses said to the Lord, “Oh, my Lord, I am not eloquent, either heretofore or since thou hast spoken to thy servant; but I am slow of speech and of tongue.”