New Defender's Study Bible Notes
9:6 died not one. It is futile to attempt naturalistic explanations for these selective miracles. The plagues of flies, cattle murrain (probably anthrax), boils, hail, thick darkness, and the death of the firstborn were all visited only on the Egyptians, sparing the Israelites (Exodus 8:22; 9:6,11; 10:23,26; 12:23). These were true miracles, with the purpose of creating Israel as God’s elect nation and of demonstrating this fact to all nations, both to Israel and the Gentiles.