Wiktionary
a. (context Christianity English) Whose sins have been forgiven due to the death of Jesus.
Usage examples of "washed in the blood".
The chalice of Christ's blood, the wine is transformed whenever Christ's blood is shed, the true blood of Christ is present, through the vision of his most sacred blood the soul is sprinkled with the blood of Christ, the precious blood, washed in the blood, in the consecration the blood flows, the bloodstained flesh, the voice of Christ's blood rings through all the heavens, the blood of Christ diffuses fragrance before the face of God.
I looked at him in the light from the Biograph marquee and I remembered Mom's story about the people dipping their handkerchiefs in Dillinger's blood and I heard the old hymn start in my head ARE YOU WASHED are you washed ARE you WASHED in the BLOOD of the Lamb and I remembered how we all thought he hung out with us freaks in the hope of leading us back to the church holy Roman Catholic and apostolic as Dad called it when he was drunk and bitter.
Sister Charity sang divinely that touching 'ymn, 'Washed in the blood of the Lamb.