“And the Lord has rewarded me according to my righteousness, according to my cleanness in his sight.” (ESV – Read the chapter)
What David says right here reflects a pre-Jesus understanding of how God operates toward us that is rooted in the Mosaic Covenant. Under that system, if someone kept the Law or at least had offered the proper sacrifices, they could consider themselves clean before God. And God allowed this to be the case even though they weren’t totally right. Their sins had been covered, but they weren’t forgiven. Once Jesus came, He revealed David’s thinking to be right, but his confidence to be very much wrong.
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