Psalm 32.1-2
Septuagint

makarioi wn afeqhsan ai anomia, 
kai wn epekalufqhsan ai amartiai.  
makarioV anhr w ou mh logishtai kurioV amartian

New Testament - Romans 4.7-8

makarioi wn afeqhsan ai anomia, 
kai wn epekalufqhsan ai amartiai.  
makarioV anhr ou ou mh logishtai kurioV amartian

Septuagint

Blessed are they whose transgressions are forgiven, and whose sins are covered.  Blessed is the man to whom the Lord will not impute sin

New Testament

Blessed are they whose iniquities are forgiven, And whose sins are covered.  Blessed is the man to whom the Lord will not reckon sin

Masoretic Text

Blessed is he whose transgression is forgiven, Whose sin is covered.  Blessed is the man unto whom Jehovah imputeth not iniquity

Comments:  The NT, LXX and the MT agree.  The NT quotes the LXX almost exactly.