The blood of Jesus did not only wash our sins away, but it washed over us clothing us in His righteousness.
"He made Him who knew no sin to be sin on our behalf, so that we might become the righteousness of God in Him." 2 Corinthians 5:19
"After these things I looked, and behold, a great multitude which no one could count, from every nation and all tribes and peoples and tongues, standing before the throne and before the Lamb, clothed in white robes, and palm branches were in their hands; and they cry out with a loud voice, saying, 'Salvation to our God who sits on the throne, and to the Lamb.'” Revelation 7:9-10