Acts 2:38-40

Verse 38

Peter said unto them, Repent - Μετανοησατε; Humble yourselves before God, and deeply deplore the sins you have committed; pray earnestly for mercy, and deprecate the displeasure of incensed justice. For a definition of repentance, see on Mat 3:2 (note).

And be baptized every one of you - Take on you the public profession of the religion of Christ, by being baptized in his name; and thus acknowledge yourselves to be his disciples and servants.

For the remission of sins - Εις αφεσιν ἁμαρτιων, In reference to the remission or removal of sins: baptism pointing out the purifying influences of the Holy Spirit; and it is in reference to that purification that it is administered, and should in consideration never be separated from it. For baptism itself purifies not the conscience; it only points out the grace by which this is to be done.

Ye shall receive the gift of the Holy Ghost - If ye faithfully use the sign, ye shall get the substance. Receive the baptism, in reference to the removal of sins, and ye shall receive the Holy Ghost, by whose agency alone the efficacy of the blood of the covenant is applied, and by whose refining power the heart is purified. It was by being baptized in the name of Christ that men took upon themselves the profession of Christianity; and it was in consequence of this that the disciples of Christ were called Christians.
Verse 39

For the promise is unto you - Jews of the land of Judea: not only the fulfillment of the promise which he had lately recited from the prophecy of Joel was made to them, but in this promise was also included the purification from sin, with every gift and grace of the Holy Spirit.

To all that are afar off - To the Jews wherever dispersed, and to all the Gentile nations; for, though St. Peter had not as yet a formal knowledge of the calling of the Gentiles, yet, the Spirit of God, by which he spoke, had undoubtedly this in view; and therefore the words are added, even as many as the Lord our God shall call, i.e. all to whom, in the course of his providence and grace, he shall send the preaching of Christ crucified.
Verse 40

Save yourselves from this untoward generation - Separate yourselves from them: be ye saved, σωθητε: the power is present with you; make a proper use of it, and ye shall be delivered from their obstinate unbelief, and the punishment that awaits it in the destruction of them and their city by the Romans.
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