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God told Israel:
Hebrews 8:12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
Hebrews 10:17 And their sins and iniquities will I remember no more.
Because Christ went to the Cross, suffered and died, Believers have forgiveness, and once saved (1 Corinthians 15:1-4, Romans 10:9-13) ever have to ask forgiveness for sin again.
Read what the apostle writes:
Romans 4:7 Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.
Ephesians 1:7 In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;
Colossians 1:14 In whom we have redemption through his blood, even the forgiveness of sins:
Colossians 2:13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;
Ephesians 4:32 And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ’s sake hath forgiven you.
Since believers are forgive, we should have forgiveness in our hearts:
2 Corinthians 2:7 So that contrariwise ye ought rather to forgive him, and comfort him, lest perhaps such a one should be swallowed up with overmuch sorrow.
2 Corinthians 2:10 To whom ye forgive any thing, I forgive also: for if I forgave any thing, to whom I forgave it, for your sakes forgave I it in the person of Christ;
2 Corinthians 12:13 For what is it wherein ye were inferior to other churches, except it be that I myself was not burdensome to you? forgive me this wrong.
As a Believer YOU have been forgiven of ALL your sins.