Matthew speaks of more than personal repentance; he evokes the Old Testament hope of the salvation of God’s people, including the justice and peace of God’s kingdom. For Matthew, and for us, salvation from sin cannot end with a prayer. Matthew promises salvation not only from sin’s penalty but also from its power. Christ’s followers are not merely heirs of his coming kingdom but servants of the King, committed to exemplifying the values of that future world in the midst of this present evil age.
Craig S. Keener, Matthew, p. 63-64.