The seventh day of Chag Matzot (Feast of Unleavened Bread) is a memorial to the crossing of the Red Sea. It’s not only the zenith of most movies about Israel’s flight from Egypt but also a parable about every believer’s path to repentance, salvation and righteousness.
Mankind can only serve one master: God or sin. We can’t serve both. God purchased all of Israel with the death of the first born to serve Him. God owns all of Israel. God is not only teaching Israel a lesson but Egypt as well. When God covered the children of Israel with the cloud and then sent them through the sea, this was a form of baptism.
Repentance is something that happens on the inside, the water is a physical representation of that repentance. Repentance doesn’t pay for your sins. Repentance is merely step 1 of our walk with God. It clears the conscience so salvation can enter. Step 2 is filling one’s life, so “Egypt” will never return.