Prefigurations of Baptism in the Old Covenant
But above all, the crossing of the Red Sea, literally the liberation of Israel from the slavery of Egypt, announces the liberation wrought by Baptism:
You freed the children of Abraham from the slavery of Pharaoh,
bringing them dry-shod through the waters of the Red Sea,
to be an image of the people set free in Baptism.
Source: Catechism of the Catholic Church (Vatican.va)