You asked

what old testament accounts show god's forgiveness 'abounding more exceedingly' even after serious trespasses?

The passage, plainly, with room to sit with it.

2 Samuel 12:13

“David said to Nathan, “I have sinned against Yahweh.” Nathan said to David, “Yahweh also has put away your sin. You will not die.””

This passage comes after the prophet Nathan confronts King David about his adultery with Bathsheba and his murder of her husband, Uriah. Nathan uses a parable to expose David's sin, and David, upon realizing the gravity of his actions, confesses. Nathan then delivers God's immediate response.

What does God's immediate response to David's confession suggest about the nature of forgiveness, even when consequences remain?

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Read alongside it

Psalm 51:1-19
This psalm is often attributed to David as his prayer of repentance after Nathan's confrontation, expressing deep contrition and a plea for cleansing.
Exodus 34:6-7
Describes God's character as compassionate and gracious, slow to anger, abundant in loving kindness and truth, forgiving iniquity and transgression.
Isaiah 1:18
Invites the people to reason with God, promising that though sins are scarlet, they can be made white as snow, emphasizing God's capacity for profound forgiveness.

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