1 Corinthians 10:4

and did all drink the same spiritual drink: for they drank of a spiritual rock that followed them: and the rock was Christ. [As Israel had an experience answering to baptism, so it also enjoyed privileges similar to the two parts of the Lord's Supper; viz.: the manna (Exodus 16:13-22), which lasted throughout the wilderness journey (Joshua 5:12), and which answered to the loaf; and water from the rock, which was given at least twice (Exodus 17:5-7; Numbers 20:7-13), and which answered to the wine. Some think that the manna and the water are called spiritual because they had a spiritual origin, being produced of God directly, and not by the ordinary means of nature; and others think that they are thus described because they were typical of Christ. But neither of these views is suited to the context, for Paul is here speaking of benefits enjoyed by the children of Israel which ministered to their spiritual strength, and which should have kept them from falling. But miraculous food is, of itself, no more strengthening to the spirit than ordinary food (John 6:26-27; John 6:49); and a type confers no benefit upon those who do not understand it and are not conscious of it. The true idea is that the manna and the water were so miraculously and providentially supplied that the people could scarcely fail to see the presence and the goodness of God in them, and hence they were spiritual food and drink to the people because they would waken such thoughts, thanksgivings and aspirations as would give spiritual strength. Paul does not assert that the literal rock or the literal water followed the children of Israel on their journey, and hence there is no occasion for saying, as do Alford and others, that Paul even referred to, much less accepted, Jewish fables and traditions to that effect. The fact that water was twice supplied by Christ at different periods would be sufficient to suggest his continual presence (Exodus 33:14), and thus continually revive their thirsty souls. The Catholics assert that there are seven sacraments, but Paul knew only two ordinances. "The whole passage," says Alford, "is a standing testimony, incidentally, but most providentially, given by the great apostle to the importance of the Christian sacraments, as necessary to membership of Christ, and not mere signs or remembrances: and an inspired protest against those who, whether as individuals or sects, would lower their dignity, or deny their necessity." But Paul also guards against that other extreme which trusts to mere ordinances for salvation.]