When John the baptist saw Jesus, he said these words:
John 1:29 “The next day John saw Jesus coming toward him and said, “Look, the Lamb of God, who takes away the sin of the world!”
Jesus Christ is the lamb of God, who died for the sins of the world.
He took away our sins, He forgave our sins.
He took away our sins, as far is east is from the west.
Psalm 103:12 “as far as the east is from the west, so far has he removed our transgressions from us.”
The proof is that Jesus died for our sins and rose from the dead, never to die again.
This means that you are forgiven all sin – believe in Jesus, to receive it.