Exodus 4:8-10

New Catholic Bible

⁸ “If they will not believe you and heed the first sign, then they will believe the message of the second. ⁹ If they do not believe either of the signs and will not listen to you, take some water from the Nile and pour it on dry ground. The water you take from the Nile will become blood on the ground.”

¹⁰ Aaron, Spokesman for Moses. Moses said to the Lord, “My Lord, I am not eloquent. I have never been so in the past nor now that you have begun to speak to your servant. I am slow of speech and tongue.”