Repentance is ongoing in the life of a believer and follower of Christ. Of course one's first act of repentance after believing in the gospel is coupled with the washing away of all past sin and it's curse through water baptism in His name ( Acts 19:3,5). This is galvanized by submission to the Spirit of God, resulting in being filled with the Holy Ghost- the power to enable your new walk.
As you grow in Grace and in knowledge of Christ, repentance will be a daily part of spiritual living.
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Psalm 34:18 The is nigh unto them that are of a ; and saveth such as be of a contrite spirit.
Psalm 51:17 The sacrifices of God are a spirit: a and a contrite , O God, thou wilt not despise.