John Chrysostom
Why does he say this? To show that, just as such gifts did not profit the Israelites, so Baptism and participation in the spiritual mysteries will not profit the Corinthians if their life does not correspond to grace.
For this reason he points to the types of Baptism and of the Mysteries. What does "baptized into Moses" mean?
As we, believing in Christ and His Resurrection, are baptized in order that we ourselves may have a share in these mysteries, so they also acted. We are baptized, he says, "for the dead" (1 Cor 15:29), that is, for our bodies.
Read more (126 words)
So they, trusting in Moses, saw that he first entered the sea and resolved to enter it themselves. Since the Apostle wishes to bring the type near to the truth, he does not speak in any other way. He even calls the type by the name of the truth.
Here he points to the type of Baptism, and afterward to the type of the sacred table. As you partake of the Master's Body, so they partook of manna. As you drink the Blood, so they drank water from the rock.
Although this was perceptible to the senses, it was given spiritually. It was not according to the laws of nature, but according to grace. Together with the body, it nourished the soul, disposing it toward faith.