Forgiveness and its first references

I'm trying to figure out the First verse to mention forgiveness in the Scriptures (Bible or other Gospels or other writings) w.r.t Eve - a savior among her progeny. Is there a reference in the New Testament or Apocryphal writings? More specifically, is there any reference to verses where the Almighty teaches what forgiveness is & to which first Human? Since the concept of 'Sin' was first from Eve, I was quoting that. Maybe there are other passages elsewhere. An example, Say, if you want to teach Lilith - 'The Screech Owl' or Natural instinctual beings what forgiveness is when such a concept is not known.