"Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit given by God to those who obey. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation, so if we do still sin we have an advocate with the Father, Jesus Christ the righteous. That if we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."
( Matthew 28:19, Mark 16:16, Luke 13:3, Acts 2:38, Acts 5:32, Romans 10:10, 1 John 1:9, 2:1 )
Psalm 19:12-13 (prayer for unknown sins committed)
Psalm 51:12-14 (prayer for restoring salvation)