When a child of God (a Christian) stumbles in sin, and seeks their Heavenly Father's forgiveness, He forgives them their sin and purifies them from all unrighteousness. (1 John 1:9)

That which God has forgiven, He does not hold against us. (Psalm 103:12)  In fact, the Bible tells us that no good thing will God withhold from those whose walk is blameless. (Psalm 84:11)