Acts 2:37-38

When they heard this they were crushed and realized what they had done to Jesus. Deeply moved, they said to Peter and the other apostles, “What do we need to do, brothers?” Peter replied, “Repent and return to God, and each one of you must be baptized in the name of Jesus, the Anointed One, to have your sins removed. Then you may take hold of the gift of the Holy Spirit.