A man is not justified by observing the law, but by faith in Jesus Christ. (Galatians 2:16)
He saved us, not because of righteous things we had done, but because of his mercy. (Titus 3:5)
For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God—not by works, so that no one can boast. (Ephesians 2:8-9)
Great passages about God’s grace and how it covers our sins.
Here’s one more to consider:
Romans 6:1-2 What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We are those who have died to sin; how can we live in it any longer?