Acts 2:38

Repent This was in accordance with the directions of Jesus before His ascension (Luke 24:47), "that repentance and remission of sins should be preached in His name."

be baptized Also enjoined by Christ (Matthew 28:19), and while there the baptism is "to be in the name of the Father and of the Son and of the Holy Ghost," and here it is only said "in the name of Jesus Christ," we are not to suppose any change made from the first ordinance, but only that as the Church was to be called Christ's, so in mentioning the Sacrament for the admission of its members His name was specially made prominent. It was belief in Christ as the Son of God which constituted the ground of admission to the privileges of His Church. This made the whole of St Peter's creed (Matthew 16:16) when Christ pronounced him blessed.

ye shall receive the gift of the Holy Ghost This is expressly stated to have been given to some of the converts (see Acts 8:17; Acts 10:47, &c.), and we cannot doubt that it was largely bestowed on these earlier penitents.