David said, “I have disobeyed the LORD.” “Yes, you have!” Nathan answered. “You showed you didn't care what the LORD wanted. He has forgiven you, and you won't die. But your newborn son will.”
“No longer will they have to teach one another to obey me. I, the LORD, promise that all of them will obey me, ordinary people and rulers alike. I will forgive their sins and forget the evil things they have done.”
Our God, no one is like you. We are all that is left of your chosen people, and you freely forgive our sin and guilt. You don't stay angry for ever; you're glad to have pity
If there were worshippers who already have their sins washed away and their consciences made clear, there would not be any need to go on offering sacrifices.