What does Exodus 9:22 mean?
Moses and Aaron are used as conduits for God's power (Exodus 4:21; 7:19; 8:5, 16; 9:8–9), though they have no innate power of their own. As promised, the Lord is about to send a catastrophic hailstorm against Egypt (Exodus 9:18). This will begin when Moses gestures with his staff. The result will be a vicious storm of hail and lightning which eradicates anything left out in the open (Exodus 9:24–25).Not every person or animal will be killed, however. God spares the lands occupied by Israelites (Exodus 9:26). He also delivered a warning for Egyptians to bring animals and servants under shelter (Exodus 9:19). Those Egyptians who wisely followed that advice preserve their resources (Exodus 9:20–21). Crops, which cannot be moved, are still lost (Exodus 9:25, 31).
God used this plague to make a distinction between the people of Egypt and the people of Israel. When Israel finally leaves, it seems that many Egyptians came along, as well (Exodus 12:38, 43, 45; Leviticus 22:25; Deuteronomy 14:21; 15:3). The Lord doesn't judge based on ethnicity, or race, or culture—only whether a person expresses trusting faith.