What does Exodus 7:22 mean?
This is one of three instances where Egypt's occultists seem to duplicate a miraculous sign (Exodus 7:11–12; 8:7). God has turned the waters of Egypt—including the river, ponds, and containers—into blood (Exodus 7:19–20). Pharaoh's men do something which convinces their king that this plague is not from God. Pharaoh's reaction is expected (Exodus 3:19–20; 7:4).Commentators debate whether the Egyptian conjurers performed a supernatural act. The other possibility is that their results were stage magic and sleight of hand. A strong point in favor of trickery is their response when the plagues become impossible to duplicate: they admit that what is happening is divine (Exodus 8:19). They can no longer dismiss these events as illusions. The other possibility is that the magicians are working supernatural acts through evil spirits. Either way, their main intent is to deceive (Mark 13:22) and deflect truth.
One of Egypt's false deities was Hapi, who was connected to the Nile and its annual flooding. Another Egyptian god of the Nile was Khnum. This plague proves both are powerless against the Lord God of Israel. Later plagues will target other aspects of nature associated with Egyptian idols.