What does Exodus 8:20 mean?
This begins describing the fourth plague: flies. God has issued a command to Egypt's king to release Hebrew slaves (Exodus 5:1–4). Pharaoh has refused, stubbornly ignoring the Lord's miraculous proofs (Exodus 7:13, 21–22; 8:15, 19). So, the Lord delivers another warning. The prior plague consisted of swarming, tiny insects. These may have been gnats, lice, or even mosquitoes. Now, the threat involves flies. As Pharaoh goes out to the Nile for his daily bathing, Moses and Aaron bring this message (Exodus 8:21). Egypt must free the Israelites from slavery (Exodus 1:11–14) or face additional catastrophes.For the first time, God specifically says that the plague will not affect the people of Israel. The Israelites lived in Goshen (Genesis 45:10), separate from the major Egyptian cities but within close range. The prior plagues of blood, frogs, and gnats may have touched the Israelites, as well. Or, they may have experienced them in a much less dramatic way. Here, the distinction between Egypt and Israel emphasizes that this is a miracle (Exodus 8:22).