Exodus 8:29-32

"And Moses said, Behold, I go out from thee, and I will entreat Jehovah that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow: only let not Pharaoh deal deceitfully any more in not letting the people go to sacrifice to Jehovah. And Moses went out from Pharaoh, and entreated Jehovah. And Jehovah did according to the word of Moses, and he removed the swarms of flies from Pharaoh, from his servants, and from his people; there remained not one. And Pharaoh hardened his heart this time also, and he did not let the people go."

"And he (Jehovah) removed the swarms of flies ..." Dobson accurately discerned the significance of this:

"As we read the story we see that again, and again, the writer emphasizes the fact that it was not Moses or Aaron who either caused or removed the plagues, but the Lord himself. See Exodus 8:28-33; 9:27-33; 10:15-19; 8:30-31; 9:5,6; and 10:13,33."[33]

The skillful development of this narrative of the Ten Plagues, with its successive gradations, and delicate sensitivity to changing scenes, make it absolutely impossible to suppose that the sacred history here is a hodge-podge scissors-and-paste job of putting together prior documents. Such theories are no explanation whatever of what we see revealed here.