John Chrysostom
Concerning the food he added nothing, because it differed from ordinary food not only in the way it was received, but also in its very substance. It was manna.
Concerning the drink, however, in which only the manner of receiving was miraculous and required explanation, after saying, "they drank the same spiritual drink," he added: "for they drank from the spiritual Rock that followed them." He also adds: "and the Rock was Christ."
The rock, he says, did not pour forth water by its own nature. Otherwise it would have poured it forth before. Rather, another spiritual Rock did all things, that is, Christ, Who was continually present with them and performed all the miracles.
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Therefore he says, "that followed." Do you see Paul's wisdom, and how he explains that Christ is the giver of both gifts? In this way he brings the type near to the truth.
He says that Christ gave those gifts, and He also sets forth this table. He led them through the sea, and He leads you through Baptism. There He supplied manna and water, and to you the Body and Blood.
Such are His gifts. Let us see, then, whether He spared the Israelites when they proved unworthy of His gifts. No.