Then Peter said unto them,.... Being the mouth of the apostles, and being ready to give advice, and speak a word of comfort to their distressed minds:repent: change your minds, entertain other thoughts, and a different opinion of Jesus of Nazareth, than you have done; consider him, and believe in him, as the true Messiah and Saviour of the world; look upon him, not any more as an impostor, and a blasphemer, but as sent of God, and the only Redeemer of Israel; change your voice and way of speaking of him, and your conduct towards his disciples and followers; a change of mind will produce a change of actions in life and conversation: bring forth fruits meet for repentance; and make an open and hearty profession of repentance for this your sin.
And this the apostle said, to distinguish between a legal and an evangelical repentance; the former is expressed in their being pricked to the heart, on which they were not to depend; the latter he was desirous they might have, and show forth; which springs from the love of God, is attended with views, or at least hopes of pardoning grace and mercy, and with faith in Christ Jesus: it lies in a true sight and sense of sin, under the illuminations and convictions of the Spirit of God; in a sorrow for it, after a godly sort, and because it is committed against a God of love, grace, and mercy, and it shows itself in loathing sin, and in shame for it, in an ingenuous acknowledgement of it, and in forsaking it: and this is moreover urged, to show the necessity of it, as to salvation, for such that God would not have perish, he will have come to repentance; so to their admission to the ordinance of baptism, to which repentance is a pre-requisite; and to which the apostle next advises:and be baptized everyone of you; that repents and believes; that is, in water, in which John administered the ordinance of baptism; in which Christ himself was baptized, and in which the apostles of Christ administered it; in this Philip baptized the eunuch; and in this were the persons baptized that were converted in Cornelius's house; and it is distinguished from the baptism of the Spirit, or with fire, the extraordinary gifts of the Spirit mentioned in the last clause of this verse; and which ordinance of water baptism was administered by immersion, as the places, Jordan and Aenon, where John performed it, and the instances of it particularly in Christ, and in the eunuch, and the end of it, which is to represent the death, burial, and resurrection of Christ, as well as the primary signification of the word, show.
And this is to be done,in the name of Jesus Christ; not to the exclusion of the Father, and of the Spirit, in whose name also this ordinance is to be administered, Mt 28:19 but the name of Jesus Christ is particularly mentioned, because of these Jews, who had before rejected and denied him as the Messiah; but now, upon their repentance and faith, they are to be baptized in his name, by his authority, according to his command; professing their faith in him, devoting themselves to him, and calling on his name.