What does Exodus 14:16 mean?
Israel has been freed from slavery (Exodus 12:40–41) and is camped by the seashore (Exodus 14:1–2). Their former captors have changed their minds and sent an army (Exodus 14:5–8) which now has the Hebrews pinned between chariots and waves (Exodus 14:9). The people panic (Exodus 14:11–12). But they are reminded that God has a plan (Exodus 14:13–15). Moses is to gesture with his staff and hand over the sea. When he does so, the waters will split apart so that Israel can walk across on dry land.This staff is the same which God commanded Moses to bring back to Egypt (Exodus 4:17); this is the one Moses was to use to demonstrate the Lord's power (Exodus 4:1–9). The staff was involved in the plagues which devastated Egypt (Exodus 9:23; 10:13). The dramatic gesture ensures that everyone knows that God is working through Moses.
The Lord knows Egypt's army will attempt to follow Israel into the water (Exodus 14:17–18). This will result in their complete destruction (Exodus 14:28)