Augustine of Hippo
Let those who wish to claim, against their own beliefs, that the worship of the one true God and the caution against idolatry need not be proclaimed to those preparing for baptism, but solely to those who have already undergone the sacrament. It should no longer be conveyed to the candidates for baptism that their instruction should be limited to faith in God, with the understanding that they will only be taught the moral laws concerning love for neighbors after their baptism. Both of these elements are found in the Law given to the Israelites after their passage through the Red Sea, similar to the experience of baptism.
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It is noteworthy that prior to crossing the sea, they were warned to shun idolatry, and once they had crossed, they learned the importance of honoring their parents and the prohibitions against adultery, murder, and other fundamental ethical behaviors.
Moses received the Law on the mountain, inscribed on tablets of stone by the hand of God (Exodus 31:18), to deliver to the people. This Law comprises the Ten Commandments and does not include mandates concerning circumcision or animal sacrifices, which Christians no longer practice. With the exception of the Sabbath, these commandments instruct what a Christian must refrain from doing: creating and worshiping idols or any deities other than the one true God, misusing the name of God, disrespecting parents, engaging in immoral acts, committing murder, theft, giving false testimony, adultery, and coveting others' possessions. Who can declare that a Christian should ignore these commandments? Perhaps when the apostle speaks of the letter that kills (2 Corinthians 3:6), he is referring to the law of circumcision and other ancient rituals that have been rendered obsolete, rather than to the commandments inscribed on those two tablets.