The church'.. being added to here... is the church at Jerusalem. These are already saved people joining in membership to the church at Jerusalem.
Acts 2:37
This verse describes the reaction of the people to Peter's sermon. They were "cut to the heart" by his words, which means that they were deeply moved and convicted by them. This is a common reaction to the preaching of the gospel, as it exposes people's sin and need for salvation.
The command to Repent, be baptized and receiving of The Holy Ghost was not the those that are saved but to the lost.
Mat_9:13 But go ye and learn what that meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.
Acts 2:37
This verse describes the reaction of the people to Peter's sermon. They were "cut to the heart" by his words, which means that they were deeply moved and convicted by them. This is a common reaction to the preaching of the gospel, as it exposes people's sin and need for salvation.
The command to Repent, be baptized and receiving of The Holy Ghost was not the those that are saved but to the lost.
Mat_9:13 But go ye and learn what that meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.