2:37-41 From the first delivery of that Divine message, it appeared that there was Divine power going with it; and thousands were brought to the obedience of faith. But neither Peter's words, nor the miracle they witnessed, could have produced such effects, had not the Holy Spirit been given. Sinners, when their eyes are opened, cannot but be pricked to the heart for sin, cannot but feel an inward uneasiness. The apostle exhorted them to repent of their sins, and openly to avow their belief in Jesus as the Messiah, by being baptized in his name. Thus professing their faith in Him, they would receive remission of their sins, and partake of the gifts and graces of the Holy Spirit. To separate from wicked people, is the only way to save ourselves from them. Those who repent of their sins, and give up themselves to Jesus Christ, must prove their sincerity by breaking off from the wicked. We must save ourselves from them; which denotes avoiding them with dread and holy fear. By God's grace three thousand persons accepted the gospel invitation. There can be no doubt that the gift of the Holy Ghost, which they all received, and from which no true believer has ever been shut out, was that Spirit of adoption, that converting, guiding, sanctifying grace, which is bestowed upon all the members of the family of our heavenly Father. Repentance and remission of sins are still preached to the chief of sinners, in the Redeemer's name; still the Holy Spirit seals the blessing on the believer's heart; still the encouraging promises are to us and our children; and still the blessings are offered to all that are afar off.

Ac 2:41-47. Beautiful Beginnings of the Christian Church.

41-47. they that gladly received his word were baptized—"It is difficult to say how three thousand could be baptized in one day, according to the old practice of a complete submersion; and the more as in Jerusalem there was no water at hand except Kidron and a few pools. The difficulty can only be removed by supposing that they already employed sprinkling, or baptized in houses in large vessels. Formal submersion in rivers, or larger quantities of water, probably took place only where the locality conveniently allowed it" [Olshausen].

the same day there were added to them about three thousand souls—fitting inauguration of the new kingdom, as an economy of the Spirit!