John Damascene

A first baptism was that of the flood [of Noah] that cut away of sin. A second was that by the [Red] Sea and the cloud, for the cloud is a symbol of the Spirit, while the sea is a symbol of the water. A third is that of the [Levitical] law, for every unclean person washed himself with water and also washed his garments and thus entered into the camp. A fourth is that of John, which was an introductory baptism leading those thus baptized to penance, so that they might believe in Christ.

For from the beginning “the spirit of God moved over the waters,” and over and again Scripture testifies to the fact that water is purifying. It was with water that God washed away the sin of the world in the time of Noah. It was with water that every one who was unclean was purified in accordance with the law, and even their garments were washed with water.