"[Peter] testified to [the Jews in Acts 2] that Jesus Christ was the Son of God, the Judge of the living and dead, into whom he did also command them to be baptized for the remission of sins."

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Because of this basin of repentance and knowledge of God, which has been ordained for the transgression of God's people, as Isaiah cries, we have believed, and we testify that the very baptism which he announced is alone able to purify those who have repented. It is the water of life. But the cisterns which you have dug for yourselves are broken and of no benefit to you. For what is the use of a baptism which cleanses the flesh and body alone? Baptize the soul from wrath and from covetousness, from envy, and from hatred, and, lo, the body is pure.

— Justin Martyr