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?
12. Now therefore go, and I will be with your mouth and will teach you what you shall say.
13. And he said, Oh, my Lord, I pray You, send by the hand of [some other] whom You will [send].
14. Then the anger of the Lord blazed against Moses; He said, Is there not Aaron your brother, the Levite? I know he can speak well. Also, he is coming out to meet you, and when he sees you, he will be overjoyed.
15. You must speak to him and put the words in his mouth; and I will be with your mouth and with his mouth and will teach you what you shall do.
16. He shall speak for you to the people, acting as a mouthpiece for you, and you shall be as God to him.
17. And you shall take this rod in your hand with which you shall work the signs [that prove I sent you].
18. And Moses went away and, returning to Jethro his father-in-law, said to him, Let me go back, I pray you, to my relatives in Egypt to see whether they are still alive. And Jethro said to Moses, Go in peace.
19. The Lord said to Moses in Midian, Go back to Egypt; for all the men who were seeking your life [for killing the Egyptian] are dead. [Exod. 2:11, 12.]
20. And Moses took his wife and his sons and set them on donkeys, and he returned to the land of Egypt; and Moses took the rod of God in his hand.
21. And the Lord said to Moses, When you return into Egypt, see that you do before Pharaoh all those miracles and wonders which I have put in your hand; but I will make him stubborn and harden his heart, so that he will not let the people go.
22. And you shall say to Pharaoh, Thus says the Lord, Israel is My son, even My firstborn.
23. And I say to you, Let My son go, that he may serve Me; and if you refuse to let him go, behold, I will slay your son, your firstborn.