From Haydock’s Catholic Bible Commentary:
In Moses. Under the conduct of Moses they received baptism in figure, by passing under the cloud and through the sea: and they partook of the body and blood of Christ in figure, by eating of the manna, (called here a spiritual food, because it was a figure of the true bread which comes down from heaven) and drinking the water miraculously brought out of the rock, called here a spiritual rock; because it was also a figure of Christ. (Challoner) — Were baptized in the cloud, and in the sea, figuratively, these being figures of baptism in the new law. As Moses, who delivered them from the slavery of Egypt, was a figure of Christ, who came to deliver mankind from the slavery of sin. (Witham)