'Forgiveness' in the Bible

To give His people the knowledge of salvationBy the forgiveness of their sins,

And he went into all the country around the Jordan, preaching a baptism of repentance for the forgiveness of sin;

And everyone who speaks a word against the Son of Man, it will be forgiven him; but he who blasphemes against the Holy Spirit [that is, whoever intentionally discredits the Holy Spirit by attributing the authenticating miracles done by Me to Satan], it will not be forgiven him [for him there is no forgiveness].

and that repentance [necessary] for forgiveness of sins would be preached in His name to all the nations, beginning from Jerusalem.