In Hebrews 11:29, the writer moves from the faith of Moses to the nation of Israel as a whole. It was by their faith that, despite the Egyptian army being upon them, they crossed on dry land, a sign of God's blessing. However, the Egyptians did not have such faith in God and so were destroyed when they tried to cross while pursuing the children of Israel. However, despite this deliverance by God, it was proven that not all of Israel was Israel. That is because the first generation (with few exceptions) had persistent unbelief and complained not only during the Red Sea crossing but throughout their wilderness wandering. That was even though they enjoyed not only deliverance from their enemies but also blessing after blessing by miraculous means. This demonstrates the distinction between the visible church and the invisible church serves as a solemn warning against apostasy and ingratitude. Ultimately, it is a reminder that salvation and inheritance come solely through faith in Christ, not merely through external association with God's people.