What does Exodus 10:12 mean?
Following Egypt's failed attempt to negotiate (Exodus 10:7–11), the Lord commands Moses to proceed with the plague of locusts (Exodus 10:4–6). God instructs Moses to use a gesture of reaching with his hand and staff (Exodus 10:13). Though Moses and Aaron have triggered plagues (Exodus 8:6; 9:33), the power belongs entirely to God (Exodus 3:20).Locusts are created when grasshoppers experience certain conditions. The grasshoppers produce offspring which instinctively swarm together, breed quickly, and aggressively eat as they travel. These "locusts" even look distinct from their parents. Such insects have devastated crops for thousands of years. A large swarm can consume an entire region's worth of plants as it passes by. This plague of insects will remove everything that survived the plague of hail (Exodus 9:31–32; 10:5).
This verse specifically mentions "the land of Egypt" twice. Though not specifically stated as in other events (Exodus 8:22; 9:6, 26), Goshen likely escaped this plague as well. This was the region where Hebrew slaves lived (Genesis 47:6). Sparing them from the disasters falling on Egypt emphasized that there was a supernatural power behind them.