3:19 Repent . . . turn. Peter’s sermon illustrates the two sides of repentance, that is, turning aside in sorrow from sin, and turning to God in faith. The call to repentance and faith is a necessary element of the apostolic preaching (2:38; 17:30; 20:21).

sins . . . blotted out. In the order of the gospel, repentance and faith receive from God forgiveness and removal of sins.