Acts 2:36-38

Therefore let all the house of Israel recognize beyond all doubt that God has made Him both Lord and Christ (Messiah, Anointed)—this Jesus whom you crucified.” Now when they heard this, they were cut to the heart [with remorse and anxiety], and they said to Peter and the rest of the apostles, “Brothers, what are we to do?” And Peter said to them, “Repent [change your old way of thinking, turn from your sinful ways, accept and follow Jesus as the Messiah] and be baptized, each of you, in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.